Gee, yeah, maybe that's why those cops they were forced to hire

wouldn't do their damned jobs.
The other day:
DePaul University Black Lives Matter protesters shut down a Milo Yiannopoulos event on Tuesday night. They justified their illiberal actions on grounds that Yiannopoulos’s speech spreads hate and violence—which, incidentally, is true, given that the students retaliated by literally attacking him.
In video footage of the event, a female protester can clearly be seen striking Yiannopoulos in the face. This took place during the Q and A, which was interrupted by the female student and another activist, student Edward Ward. They were joined by ten other irate students. Yiannopoulos’s supporters tried to stop them, and police and security were called.
But neither the police nor campus security did anything to stop the activists. This was ironic, because DePaul had forced the College Republicans to pay several hundred extra dollars for security for the event, according to The College Fix.

And we find out
The second lead protester at last night’s event at DePaul University has been identified as Kayla Johnson, the daughter of Juanita Johnson, who serves as the Chicago Police Department’s Director of Administration.

Johnson rushed onto the stage behind Edward Ward, a political science graduate and minister who led the effort to shut down Breitbart Tech editor Milo Yiannopoulos’ event. From the stage, Johnson shouted at and taunted attendees. Eventually, she grabbed the microphone from an event organizer and taunted Yiannopoulos with it, taking several swings at his head.