Besides knowing the fact that it is for a bigger picture but i like this thread because it makes me think if were to rewind the time, wouldn't HHDL do it differently without causing so much anger, sangha community divided, harm and ill spoken words of an enlightened being etc etc.. Interesting.
If we believe that His Holiness is the reincarnation of Avalokiteshvara himself, sure he operates from compassion and I believe he has weighed all the pros and cons of the action. But is there any other better way? I am sure His Holiness will have his reasoning. China is the fastest growing country in the world now, the population is overwhelming, and the people have become very materialistic and dharma is much needed over there. The only thing i can think of is since the Chinese dislike His Holiness so much, by manifesting flaws, the Chinese will pick up the practice and spread into China. Once the chinese starts practicing, it will spread to the world. If we look at the very qualities of Dorje Shugden is to grant your wishes very swiftly, so by hooking you onto your worldly wishes then you'll gain merits to be able to receive the dharma. Don't forget, afterall he is Manjushri himself.
As for the harm and abandoning of the guru that happened along the way, I have no comment on those, to me those incidents are just accumulated personal negative karma. As for harming His Holiness's health, he is Avalokiteshvara. Enough said.