Maybe encouraging violence will cross the line - even with some of Trump's supporters.
Although it is hard to say what is required. Seems there's a supportive proportion of any society which emerges when a violent bully appears on the scene with simplistic solutions. Hopefully it is not enough to win an American election. For anyone with a grain of sense, he has disqualified himself as a presidential candidate.
I think everyone is hoping for the tide to turn on March 15th. The Ides of March.