>Since police are part of the law, when they don't hold their own accountable, there's no recourse. And that's a real problem.

I don't see how this is a relevant factor for the two cases I mentioned. Sure, it's bad that are part of the justice system, and therefore you can't use the justice system to correct their misbehavior, but you're not going to involve the justice system for incompetent teachers, or not enough doctors being admitted. For all intents and purposes the dynamic is the same.