Would you throw a rock at a random police officer walking down the street? No? Then why should the presence of Donald Trump motivate you to do so, to take up a weapon and act in a way that you would not under other circumstances?

Many people find Trump objectionable, but that does not justify the thuggery of left-wing protesters wherever he goes. If asked to enumerate what they dislike about him, the list would doubtless include his inclination to threaten opponents, his disdain for rational debate, and his pandering to violence. But these are precisely the traits the lefties are themselves displaying.