Most, if not all of these ripping-the-fabric-of-suburbia shootings, are committed by white kids, but that doesn't mean you screen all the white kids more when they get to school each morning. It really is the same disturbed percentage of the population as Muslims face. Yes, they'll vote for extremists, but how many of their voters would honestly pull a trigger or blow themselves up?
Point is, don't fall for the easy (and ineffective) solution. Find one that works, and there is little support for the idea of singling out Muslims in the hopes of making terrorism go away. Root causes are far more important, and are harder to fix.