When seeing America’s we’ll-fight-to-the-last-Ukrainian approach to Russian aggression, many Arabs conclude that the U.S. can’t be counted as a security guarantor, and that nuclear weapons—which Russia has, Iraq didn’t and Ukraine gave up—make all the difference. To be sure, many of my Arab interlocutors have perfected the art of expressing grievance through historical cherry-picking: highlighting America’s inadequacies while sidestepping their own governments’ follies and self-inflicted wounds. The reality is more complicated, and no critique of American policy can justify indulgence of Russia’s criminal behavior or reluctance to lend assistance to the Ukrainian people. These Arabs have a point, however. If...