The recent attempted assassination of Republican presidential hopeful Donald Trump, which resulted in the death of one rally attendee and injuries to the candidate and two others, was not an isolated event. The high profile incident occurred against a backdrop of lower-level attacks and violent protests across the country that indicate too many Americans are increasingly willing to exchange battles over ideas for fists, bullets, and firebombs. It’s a sign of an existential political climate in which nobody thinks they can afford to lose—or that opponents can be allowed to win. Not-So-Isolated …