From other sources it sounded like, at least initially, the LAPD was trying to portray his manifesto as the musings of a madman, but based upon that amnifesto, Dorner sounded like an eloquent and thoughful man that was pushed to his breaking point...
In his writings he mentions certain types of cops and specific individuals who he planned to target, but were any of the people that he killed even remotely related to his history/backstory? I know he killed the daughter/son in law of his former attorney, but his writings suggested that innocents, for the most part, would be spared. That doesn't seem to be how it went down though...