For years, it has been my position that the threat of radical Islam implies an imperative to focus security measures on Muslims. If searching for rapists, one looks only at the male population. Similarly, if searching for Islamists (adherents of radical Islam), one looks at the Muslim population. And so, I was encouraged by a just-released Cornell University opinion survey that finds nearly half the U.S. population agreeing with this proposition. Specifically, 44 percent of Americans believe that government authorities should direct special attention toward Muslims living in the United States, either by registering their whereabouts, profiling them, monitoring their...