Not sure about the politics of it, but I agree it’s a sad day. Those bastards murdered Kelly Thomas. And they should be in prison for the rest of their lives.
Cops have tough jobs. Sometimes they have to make life-and-death decisions and sometimes they only have a fraction of a second to make those decisions. Sometimes they get those split-second decisions wrong. In those cases, the cops need to be protected from prosecution. Nobody can get every split-second, life-and-death decision right.