LAPD are the 'bad guys'. Just look at their track record. Admittedly, there are a lot of good guys in the LAPD, but there are way too many scum. Those that do the illegal actions, and those that stand by and don't stop or otherwise report them for their wrongdoing.
Yes, those that do nothing are bad guys as well since it's their job to stop the illegal activities, especially those of other enforcement officers that are supposed to be stopping crime in a legal fashion rather than performing crimes. (Let the punctuation prefects figure out how to sort that sentence out.)
You ever heard the old statement that "one rotten apple spoils the barrel"? Well, they've got a lot of rotten apples in their barrel. Even their own investigations into themselves have shown that. And it leads all the way to the top as they have consistently done nothing to curb it or punish the wrongdoings that have been identified until it splashes all over the media and they've got politicians breathing down their necks. And even then, they do the bare minimum to mollify the politicians.
There is no easy fix for the LAPD due to the extensive and ingrained corruption from the beat to the big boss in charge. A clean sweep might work, but there actually are some good cops there that would get screwed by that, and more importantly, it would leave the city in a major lurch for far too long to be considered acceptable. On top of that, the cost would be huge and I have no idea if LA could even afford to do something like that, and that's without even taking into account the numerous lawsuits that would inevitably happen from many different sources.