It is ludicrous to argue that, because the hard Left is primarily responsible for the outbreak of chaos and violence that caused Donald Trump’s Chicago rally to be canceled last night, it is wrong to condemn the thuggery Trump often encourages at his appearances. Trump has encouraged physical battery at his campaign events, even telling supporters he’d pay their legal fees if they get arrested for assaulting dissenters. (See, e.g., Iowa event: ”So if you see somebody getting ready to throw a tomato, knock the crap out of ‘em, would you? Seriously. Okay? Just knock the hell — I promise...