Coulter advocates violence on campus. Why should she be allowed to speak?

http://www2.ljworld.com/news/2005/mar/30/ann_coulter_causes/

Moments later Coulter stopped and called for assistance from students when hecklers started in again and no one of authority was seen trying to stop them.

"Could 10 of the largest College Republicans start walking up and down the aisles and start removing anyone shouting?" Coulter asked. "Otherwise, this lecture is over."

Several people responded, leaving their seats to confront the hecklers, and verbal confrontations erupted in parts of the auditorium.