He came, he saw, he confused. Joe Biden’s call-to-arms speech in Poland was long on soaring rhetoric about the virtues of democracy but woefully short on what more the West will do to help Ukraine defeat the Russian invasion. But by the time he got to the finish, most of that was forgotten. What mattered most and what will be remembered for a long time was a single line the president of the United States said about the president of Russia: “For God’s sake, this man cannot remain in power.” In the context of the speech and the slaughter of...