Well, you think that they are doing evil, but from the union's perspective, they need to choose whether to err on the side of under-protecting their members, or over-protecting them. The police unions (and most others) choose to over-protect their members.
>>nickff+(OP)
It looks like they might be overprotecting themselves out of their jobs, after building a 30-year case on video of their inability to self-regulate across dozens of cities.