What do these events have in common?A deranged Bernie Sanders supporter opens fire on a group of Republican congressmen at baseball practice and would have killed them all but for the unusual presence of two Capitol Hill police officers.A version of Shakespeare’s Julius Caesar features the assassination of an actor who, instead of wearing a toga, is dressed to look like Donald Trump. A comedienne for CNN appears ISIS-like, holding the image of Donald Trump’s severed head – dripping with fake blood.On college campuses throughout the country black students insist on separate, black-only graduation ceremonies and at one institution black students...