I'm not good with poster screennames and all but i respect yours cause from what i remember you're one of the more reasonable dudes on here.
i disagree with you on this one though. there's a lot of issues though. First of all, he got fired for doing the right thing. that counts for something. meaning he wasn't like the rest of them. had he stayed there, he would still stand up for what he believes justice is so we disagree on that. he would still be checking other officers for bad behavior, corruption and criminal activity but the legal way from the inside.
I completely disagree with his actions, that part we agree on. I don't care about the fact that they're black/asian or white. His quest has nothing to do with justice. it's about revenge (a selfish motive). He said he went through and exhausted all the legal channels though.
Its easy to say dude is mentally unstable and blabla. and he probably is. but the mind is a very fragile thing. and the way he was treated by the LAPD and the system kinda pushed him over the edge. This doesn't excuse any of his actions. He's not a hero, he should be brought to justice for his crimes. but real justice. and if his claims are true, then the LAPD should also answer for their crimes and are partly responsible for this whole thing morally. if his claims are true then it was just bound to happen one day (if not from him than from someone else in another scenario). If you systematically fukk with people's lives, brutalize them, frame them, kill them, oppress them, terrorize them, etc, it becomes a numbers' game. You're bound to eventually tick off a mentally unstable individual. Doesn't mean the individual is right, is a hero or is justified. But you still brought the consequences on yourself over time.
this is assuming what he wrote in his manifesto is accurate.