Breitbart recently started compiling what it characterizes as "acts of media-approved violence and harassment against Trump supporters." The list is now up to 258 — and climbing fast. So far this month, Breitbart counts more than two dozen incidents of threats, intimidation and violence against Trump officials and supporters, or mainstream journalists excusing such actions. That's likely just scratching the surface, since no doubt many abuses go unreported. The left defends such actions as justified because of Trump's policies or his actions. The truth is, this is how extremists on the left always respond to politicians and policies they disagree...