Could America split up?

All week I've been haunted by a brief few seconds of video posted on Twitter late Sunday night by a student journalist in Eugene, Oregon. Two men face off at a protest — the one standing on the left is demonstrating for Black Lives Matter; the one on the right, sitting in a pickup truck, is a counter-protester. Each is pointing a handgun at the other's face at point blank range.

That's us. That's America during the long, hot summer of 2020.

I often catch myself pondering exactly what it...