Criminal justice doesn't work quite the way you might imagine in this state. I mean, there were two propositions on the ballot a couple of years ago: one to eliminate the death penalty in the state, and one to eliminate most of the appeals for death row inmates, and the first one failed hard, the second one passed by a huge spread, at least 15 points.
I've dealt with the LA County DA's office much more directly than I'd like to have done, and if anything, they're basically the opposite of what you seem to expect. DA Cooley got in trouble for his use of conviction rates for promotions (nothing came of it) and pushing somewhat aggressive over-charging (the shotgun approach), and he got three terms, his campaign ads were all "My dad was an FBI agent and I swear to aggressively prosecute everyone!" LASD's Office of Internal Review is a complete fucking joke. (Then there's all this: https://en.wikipedia.org/wiki/Lynwood_Vikings . And that's not ancient history, Tanaka was Assistant Sheriff until 2011.) County lockup was bad enough that the feds got involved, so Tanaka and former sheriff Baca are both in prison. After him, Villanueva defied court orders to clean up the deputy gangs, covering up beatdowns in county jail, more of the same. (I don't know much about the new guy but I'd be astonished if things are different.) LA might have a higher rate of "write down that he was resisting arrest" than most small towns.
Chris Dorner did nothing wrong. Orange County is basically Karens that think jaywalkers should get the death penalty, so that's how they vote down there. I imagine you come out of lockup with all your teeth but still not the kind of place you wanna deal with the criminal justice system. Other than LA ("law and order") and Orange County, the only heavily populated counties are in the SF Bay Area or San Diego (navy town).