Not to comment on Lamas, but I would really like to investigate the case of Lelung Shepay Dorje who is documented in Trijang Rinpoche's biography. This is his story in Trijang Rinpoche's Music Delighting the Ocean of Protectors:
As said in the biography of Ratreng Trichen Tenpa Rabgya,
If someone has completely confused the teachings, mistaken the earth for the
sky, the powerful protectors of the Gelugpa chain them up in unpleasant
bonds. It has happened many times, past and present.
As he says, previously at Olka Lelung there was one named Jedrung Lozang
Trinley also known as Shepay Dorje, a great being renowned to be the Lhodrag
Mahasiddha Lekyi Dorje's emanation. He studied at Ngari Tratsang in the early
part of his life and became a great scholar. He kept the Lhodrag ear?whispered
lineage teachings and Chakrasamvara as his innermost essence practice. He had
attained realizations at quite a high level and cultivated pure view and action of
the Geden lineage. At one point he began practicing a secret wisdom teaching in
accordance with a Mindrol Ling treasure text and began emphasizing it in his
teachings to his many disciples, both lay and ordained. In the name of offering the
wisdom consort and offering nectar, he and all the disciples gathered many young
women around them and enjoyed drinking intoxicants without restraint, singing
and dancing. They started many monks of Sera and Drepung, lamas, tulkus and
geshes into consort practice. With such actions as these they threw proper Tantric
conduct into disarray, perverting it. The three, Purchog Je Ngawang Jampa,
Shogdon Yo Kedrup, and Lelung Jedrung Rinpoche were all mutually teacher and
disciple to each other. Once they had gathered at Miwang Polhawa's place at
Gaden Kangsar in Lhasa. Purchogpa and Kedrupa tried to dissuade Jedrung from
what he was doing, but acting as if the time for his actions had been prophesied
by the dakinis, he would not listen. That time, during their practice, this
Dharmapala himself revealed many various warning manifestations but he would
not pay the slightest attention and kept on as before. In dependence upon ritual
activities such as fire pujas, he did not live out is full span of life. Spraining his neck
in bed, he died. His next incarnation became a monk and entered Drepung
Loseling Kongpo house, and, after he had obtained his Geshe degree, entered
Gyuto Tantric College. He also became abbot of Gyuto. At that time he took a
wisdom consort, but again making a mistake in the order of practice, such as not
first resigning from the abbotship, he died without completing his practice. Even
in the case of his successive incarnation, as he was studying at Drepung, he
performed Powa and had a rupture on his crown from which pus and blood was
emitted. No matter what remedies were attempted, they didn't help. He never
got well, remaining sick for months and years. His incarnation was born as my
younger brother in Kyisho Tsel in Gung Tang but, having been recognized, when
he was about to be enthroned, he died suddenly of smallpox. The present
reincarnate Rinpoche has the probelem of one eye being askew. Thus, throughout
his incarnations, his activities have not fulfilled the meaning of the path. Similar
things have occurred to many lamas, great and small, past and present, who were
proud of being followers of the Geden teachings but polluted their bowls with
dirty water, as evidenced by many signs demonstrated in the past and present. It
is for this that praise is offered in this verse.
In the same page, he defends Pehar:
The Great Fifth Dalai Lama's main lama was Minling Terchen Rinpoche
Gyurme Dorje Tsel, an undisputed great treasure revealer at whose feet he
studied for a long time. The biography of one of that lama's disciples, the Vajra
Master named Chechog Dupa Tsel or Losel Gyatso, is called Dispelling the Darkness
of Torment. As quoted by Lelung Shepay Dorje who kept Losel Gyatso's genuine
miscellaneous writings in order, it says,
Again, at a later time, Morchen Dorje Chang Kunga Lhundrub spread the
practice widely, saying that since now is the time for all of his special pure
visions to be fulfilled one must rely upon this Great King, himself. He would
speak of incredible benefits. Even then, some would say it is not good and
claim that those who spread the practice of this King's activities are terrible,
but they do not understand the main point: Vajradhara has said that he is
definitely the emanation of a great master, a great clarifier of the teachings.
Also, at that beginning period, this King was more powerful than any harm
that could be wrought against him and his activities even increased at that
time. Morchen himself was more effective at that time, in terms of his
teachings serving to train disciples, which ultimately comes down to the same
point, if you check.
110o take an example, those such as the great yaksha Tsiu Marpo and
King Pehar are, in actuality, definitely Buddhas, and fully renowned as
protectors of Buddha's teachings. Yet the story is told of how Pehar
experienced obstacles and did not complete his Dharma practice and there
are many stories of his harming Dharma practitioners. Many great beings that
have gone to Samye Monastery tell of a great yaksha making them leave. As
regards wrathful types of action, Ra Lotsawa did away with thirteen vajra
masters such as Darma Dode with fire pujas, and all of his actions were only
those of a Buddha performed with special awareness for necessary reasons.
With one expression Pehar may help someone, and with another he may
obstruct someone, but his actions are not conceivable to ordinary thought.
When dispatched for activity, Pehar is made offerings in the aspect of a
Dharma protector and requested to perform activities, while, on the other
hand, the very same Pehar is often dispatched on missions in the aspect of a
demon. Understanding these profound points alone is completely liberating.
Still, if I am criticized because this does not conform to modern belief systems
or is difficult for the Geshes to comprehend, I can only say, I am sorry.
Also mentioned in the same book:
Pretending to be Dragshul Wangpo, you tormented the oracle
By swallowing a vajra in his throat,
And repeatedly split his temple abode, and so on,
Praise to the terrifier of even the great gods!
When all the deity's people took refuge in you and made requests,
Saying, 'Build a statue of Tsongkhapa and I will grant activity!'
You gave them relief
And justified belief, praise to you!
Dharmapala demonstrated various miraculous emanations to Lelung Shepay Dorje
who tried various Tantric rituals such as wrathful fire puja to overcome him.
Therefore, to the common point view, they appeared to be at odds and, before
Lelung Shepay Dorje died, Dharmapala showed him wrathful emanations. In
somewhat of a wrathful aspect toward Lelung Shepay Dorje's teachings'
protector, Dragshul Wangpo, as well, with miraculous emanations he split his
temple abode at Lhaden Darpo Ling so that it collapsed. No matter how many
117times it was reconstructed he would split it and destroy it again. Moreover,
pretending to be Dragshul Wangpo he entered the deity's oracle at Darpo Ling
and, shaking the oracle's body, swallowed a five?spoked vajra. Once it had lodged
in his throat he left the oracle's body. The vajra would not come out, the oracle
was in pain and at the verge of death. All of the benefactors and supplicants of the
deity were terrified. It became so bad that they invoked Gyalchen to enter the
oracle and then made offerings and supplications. He said, 'If you build a qualified
statue of Je Tsongkhapa in Darling Monastery I will perform the enlightening
activities!' As soon as they promised to do that, the vajra easily came out of the
oracle's throat. Here the praise is for revealing this kind of direct observable
evidence that develops faith and conviction.
After many years the building of the Darling protector palace was in ruins
so that, at one point, those in charge of the property from Tse Namgyal Dratsang
restored it. Responsibility for the construction was accepted from Thubten Dawa
by Dodam Dezur Kenchung who, in connection with invoking the Dharmapala of
Darling, removed the basal objects from the protector palace. He found an
extremely old tendö, thread construction, that had been there many years.
Behind it, underneath a pile of various newer and older dö, thread crosses, was a
brass five?spoked vajra that the Darling Dharmapala took out and said, 'This is
Dorje Shugden's vajra!'
An accounting of it was given to Dezur Kenchung stating
only that such a vajra had been found behind the thread construction. Dodam
Kenchung himself wrote of wondering what was this vajra that had been taken
out and given to him by the Darling Dharmpala, of which no one, including the
previous oracle, had known was there. This story from previous times again
provides evidence for conviction and belief
Now, why was Dorje Shugden so wrathful towards him? The answer is simple: he is a Gelug Lama trying to be a Nyingma lama and confused a lot of people in the process. In the end, he had harmed a number of people (refer to first story) and Dorje Shugden had to do something to stop him before he harmed more people. The Gelug tradition does not believe in termas, and for a good reason: if it is something that cannot be proven, what guarantee there is that it can benefit others. Therefore, even though Lama Zopa was a Nyingma practitioner in his past incarnation, he did not reveal any termas and followed the Gelugpa way all the way.