I read this guys manifesto in it's entirety. Sad thing is, he thinks this will bring media attention to the police abuses and brutality, but all this has done is caused them to disregard what he is saying, and focus on him killing people. There are much better ways of trying to get media attention for police abuse, the blue wall, and his being let go from the force.
I do believe him that most of what he says is true concerning the police abuses. I mean lets face it, we see this stuff in the news, and online almost every day. But again, he is killing people, and that alone uses up any credibility you had with most reasonable folks.