Police forces in many other nations can more or less be trusted to provide somewhat accurate data. When they don't, it often becomes a scandal. In the US them not providing accurate data seems more or less the rule. I once wanted to compare the numbers of bullets fired during service between different nations. There are nations where every single bullet that has been fired during service is accounted for and categorized whether ot was shot at a person, a warning shot, a shot at an animal and then there are areas where you won't even get a total number.

If you are a law-abiding citizen that wants a good police force, accountability needs to happen. And it is totally appropriate for citizens to take this into their own hands if the police departments and the political powers can't manage to make it happen. If people see that the LAPD is caught lying about cases and numbers repeatedly without consequences, what other course of action is there?

If I were a LAPD official I would see this as a sign that the public doesn't trust my numbers and I would try my best to figure out a way to change this.

A police force is provided with great power. And with great power comes great responsibility. And that responsibility is not towards your colleagues who killed innocent people, but towards the public. If you are proven to be unable to act responsibly it is in order for the public to find measures to hold you responsible. This is — by nature — political, but I don't think it is divisive.

A responsible police force should be in the interest of every political orientation, unless we are talking about authotarian or fascist movements — and then you got an entirely different set of problems, because they don't believe in the rule of law to begin with.