He must have got that from Baltimore's mayor who'd said "we have to give them space to riot...."
Baltimore Mayor Stephanie Rawlings-Blake gathered reporters to explain how a public tribute turned into a small war zone:
“I made it very clear that I work with the police and instructed them to do everything that they could to make sure that the protesters were able to exercise their right to free speech,” she said. “It’s a very delicate balancing act. Because while we tried to make sure that they were protected from the cars and other things that were going on, we also gave those who wished to destroy space to do that as well. And we worked very hard to keep that balance and to put ourselves in the best position to de-escalate.”
What a moron.