I guess I would draw the line at violence. Anytime someone uses violence to suppress speech no matter the type that's a problem. If the government fails to protect the speaker from violence and again fails to punish the violent offenders then the government is defacto suppressing speech. That's the problem with that milo guy. Guy maybe a total ahole but allowing violent protesters to deny him his right to speech, and the right of those attending to listen sets a really bad precedent. Because in many cases the local police choose not to press charges they basically complicit in the suppress of speech. The comic misses big picture of one group of people using violence to denying another group their legal rights. Clearly somebody wanted to listen to milo and they were not allowed to. He wasn't shown the door he was made to leave by an intruder at gunpoint.