Police killing is not the work of vigilant warriors defending society at great personal cost, and sometimes going too far. It is the day-in, day-out petty tyranny of a taxpayer-funded bureaucratic lobby group. The difference is that, unlike other public sector unions, police unions have military-grade equipment they can use to violently crush protests against their abuses, and they are legally immune from most consequences. They’re teachers’ unions, but with tanks and endless get-out-of-jail-free cards.