War and democracy have always been more comfortable bedfellows than they should be. Our own history makes that perfectly clear. During the second world war, the US sent Japanese Americans to internment camps. During Vietnam, the FBI surveilled and attacked anti-war and civil rights movements. And the “war on terror” led to a massive assault on civil liberties, especially of Muslim and Arab communities. The longer wars continue, the harder it is to reclaim those lost liberties. More than 20 years after the US invasion of Afghanistan, the 2001 Patriot Act’s attacks on civil liberties remain and US police departments...