I think one of the commenters is correct that the unionized cops are complicit.
I think they’re stuck between a rock and a hard place with idiots on all sides. An army of lawyers on one side waiting for a reason to sue, anarchist scum trying to provoke action. On the other side are the idiots whining about them not taking action, leadership that doesn’t order action and a city government so paralyzed with fear that they won’t accept responsibility for any of it.