Has anyone actually read his manifesto? He used to be a cop, and saw severe police brutality, blackmail, and bribery before he decided to quit. He'd been trying to fight intensive corruption in the LAPD for nearly a decade afterwards.. It went as far as him receiving death threats when he tried to rustle up witnesses, and his case being thrown out of court by a corrupt judge when he dismissed said threats. The final option was his last resort.
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The manifesto is a confused mess of a conflicted man. Even assuming every single word of his manifesto is true (which at this time, we have only circumstantial evidence for his accusations), his ultimate action taken almost completely nullifies any point he was trying to make. He attacked officers who weren't involved and killed an officer named in his manifesto's daughter and her fiance. He bemoans the state of bureaucracy and corruption that he claims led to his firing and disgrace, but when given the personal choice to rectify his wrongs in a humane manner, he instead murders innocent civilians and attacks officers because it suits his interest to do so, so that people will mistakenly believe him to be on their side and betray the common good of the people for some personal grandeur. Dorner and his supporters are, ironically, the type of hypocrite he accused people of in his manifesto.