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.
