I was a selfish child. Make that a self-centered child marked by a self-possession that I wore as a kind of armor against difficult parents and, later, other difficult authority figures. When I was 13, I had a teacher who told us students that selfishness was the root of all evil, the vice from which all others emanate. (She herself was a horror who should’ve practiced what she preached.)

But there is a fine line, I understood, between selfishness and self-possession in service of self-preservation. Recently, one of the columnists I edit wrote a piece in which he observed that there’s a reason that airlines ask you to put on your own oxygen mask first in case of an emergency: You cannot help others if you yourself are in harm’s way.

Which brings us to the new era – actually the cyclical era – of America First. ...