The president’s demeanor is worrying a lot of people. From the immigration crisis on the Mexican border to the Islamic State rising in Mesopotamia, Barack Obama seems totally detached. When he does interrupt his endless rounds of golf, fundraising, and photo ops, it’s for some affectless, mechanical, almost forced public statement. Regarding Ukraine, his detachment — the rote, impassive voice — borders on dissociation. His U.N. ambassador, Samantha Power, delivers an impassioned denunciation of Russia. Obama cautions that we not “get out ahead of the facts,” as if the facts of this case — Vladimir Putin’s proxies’ shooting down a...