"To summarize, in liberal left wing California, it is (was in the 90s) perfectly legal to shoot a fleeing violent felon"
Yes it was, also in NY. The laws were changed because of public outcry over police shooting various unarmed fleeing people and because some of the families of shooting victims won 7-8 figure awards in civil lawsuits.
What this and other videos show is that cops never really stopped doing it. They just made up stories to cover it up and discredit anyone who claimed differently.
Now that dashcams and personal cameras are ubiquitous, it's showing that there are enough criminal thugs wearing blue uniforms that universal suspicion is justified. If USA police want to be regarded without suspicion then corruption in their midst (and make no mistake, this IS corrupt behaviour, as is covering for it) needs to be rooted out and exterminated.