“Clearly, police misconduct is more widespread than many want to admit. In Chicago, the shooting death of Laquan McDonald, caught on camera, has roiled minority neighborhoods because they see it as only the most recent episode of police wrongdoing there. It is safe to say that other cities may be one incident away from similar unrest.
Mayors and city councils don’t want police misconduct to occur, but in too many cities they let the problem fester. To the extent that they’re even paying attention, the typical political calculation seems to be this: it’s better to have the support of the police department and police union come election time, so don’t take steps that they will oppose.
There is, however, a cost to that political calculation: minority resentment toward city government—especially the police. After all, the victims of illegal detention, illegal searches and excessive force have friends, neighbors and relatives. And when bad cops are not dealt with, it is not unfair to conclude that the department itself is indifferent to injustice. This explains the rise of the Black Lives Matter movement.”