They are wrong. In any war, even the most just, maintaining domestic support is essential to victory, because the outcome is inherently uncertain. To be sure, the complaint that the Trump administration has not specified exactly how and when this war will end is captious. Abraham Lincoln did not know how the Civil War would end, and Franklin D. Roosevelt did not know how World War II would end. Woodrow Wilson was utterly mistaken in what World War I would achieve; George H. W. Bush, similarly in error, thought the Gulf War would culminate with the overthrow of Saddam Hussein and a new era of security in the Persian Gulf; Barack Obama probably did not think that the sustained bombing of Libya in 2011 would create as much chaos as it resolved. Wars never end the way those who engage in them think they will.