How to engage a fanatic

I'VE had a series of experiences over the past two weeks that leave the impression that everybody on earth is having the same conversation: How do you engage with fanatics?

First, I was at a Washington Nationals game when a Trump supporter in the row in front of me unleashed a 10-minute profanity-strewn tirade at me, my wife and son.

Then I went to the University at North Carolina at Asheville and watched some students engage in a heartfelt discussion over whether extremists should be allowed to speak on campus.