My old friend and mentor Tom Palmer urged me to sign this petition in defense of free trade with these words: “It is super important — to me, but I think to everyone else, too.”  The highlight of the petition:

But the fact that protectionism destroys wealth is not its worst
consequence.  Protectionism destroys peace.  That is justification
enough for all people of good will, all friends of civilization, to
speak out loudly and forcefully against economic nationalism, an
ideology of conflict, based on ignorance and carried into practice by
protectionism.

Of course, I think attributing protectionism to ignorance is overly charitable