No. The difficulty with that is that is so wide it could include situations where the person is provoking an attack upon himself. You could have a situation that we generally refer to as the “heckler's veto”. You don't want to penalize the speaker because of the violence of his audience. You may penalize a speaker if the speaker is urging the violence by his supporters against others, but not if what he says is so unpopular that he's attracting the violence to himself.
On June 16th, 2009. See this statement in context.