Trump's tone is abrasive, but do you remember the time he sucker punched someone he was yelling at instead of continuing to debate? Me neither. Despite what we want to infer from his personality, you don't get to his level by being out of control or incredibly impulsive. Besides, he's already started sabre rattling, but the threats are usually for the US to stop doing X, rather than to start doing Y. It creates a whole new set of incentives, and that's really the only way to change the world situation.