I heard an interesting (and quite beautiful) proposition a few days ago, that Dorje Shugden didn't arise out of wrath. It pulled me back to the reason why he is a protector, and became a protector - even though wrath was the emotion being generated at the time of his death, he actually arose out of great compassion. The teaching wasn't elaborated so these are just my thoughts.
Even in his manner of dying, he showed so many signs of his attainments:
(1) Compassionately for the rest of us, he allowed his murderers to make two failed attempts first. Wouldn't you get increasingly annoyed or wrathful if people kept trying to kill you? And be pretty ticked off when they finally did? Imagine if they'd been successful on attempt #1 - for someone who'd got rid of anger in their mind-stream, perhaps he wouldn't have been able to generate 'sufficient' wrath if he'd been killed on the first attempt.
(2) His wrath didn't arise from anger that they'd managed to kill him, but from his compassion for the kind of karma his murderers would face, which is reflective of his current behaviour/role as a protector.
(3) Of course, as someone who had got rid of anger in their mind-stream, he has total control over his body, speech and mind - that is, he CAN generate wrath if he wants. Why allow himself to die such a controversial death? Well, isn't the controversial death still being discussed to this day, and helping to spread the Dorje Shugden name? Again, compassion.
(4) Then there's also that he gave his life up for the Dharma. The wellbeing of sentient beings was more important than his mortality. Keeping his promise to Nechung was more important than his mortality. Compassion again.
(5) In death, as violent as it was, he was in total control - he GAVE his murderers the means to kill him.
I open the floor