I don’t know how you do it.

How you stay on social media; how you can even bear to check your phone. I have enough trouble just turning on the television or picking up a newspaper, trying to imagine what today’s fresh tragedy will be. Knowing with near-certainty that there will be a fresh tragedy.

On Tuesday evening I made the mistake of turning the kitchen television to CNN while Sarah’s five year old was eating dinner. “Why is that building on fire?” he shrieked. “It’s not real is it?”

I assured him it almost certainly wasn’t. “It’s just a movie?” he asked. I think so, I said...