Chaos won't make America great again

Donald Trump's destruction of the United States' alliances since retaking office has been rapid and erratic. His tariffs come and go and come again. His justifications for them shift so constantly as to be meaningless. He says Russian President Vladimir Putin is a friend, while Canada and the European Union have been "ripping off" the U.S. and are going to get what's coming to them. America's putative allies are rightfully stunned by Mr. Trump's undoing of the postwar order. "It's like there's a horse loose in a hospital," as the American comedian John Mulaney once joked about Mr. Trump's first…