There are over a billion Muslims in the world. Many of them can and do live peaceably in liberal, secularized societies--but not all, as evidenced by the Boston Marathon bombings, the Fort Hood shooting, the Pulse Nightclub shooting, and the San Bernadino shooting.

The United States faces less Islamist terrorism than Europe or the Middle East, not only because the US has a much smaller Muslim population and significant barriers to immigration, but also because American Muslims (with certain noted exceptions) tend to be more likely to accept liberalized values than Muslims elsewhere in the world.