We pay taxes for cops. Cops are people, not robots. Which, I'm sure everyone would agree, is a very good thing on balance. But the fact that they're people also means our tax money necessarily goes to people who sometimes screw up. Sometimes badly. No way around it.
In turn, that means we're implicated when they screw up. It's not our fault, but we have SOME measure of accountability. Reddy45, Ihatetochangeoil, and SeaJay are right. It's on us to make sure this happens less -- OR to accept it as a side-effect of whatever system our priorities produce.