Guilt by association isn't and has never been a valid reason for doing things in this country. Otherwise, we'd have to start randomly stripping down unshaven libertarians in the street at random to make sure they weren't carrying any dangerous manifestos or plans for package bombs, and, frankly, I'd miss Conchaga.
Even disregarding the fact that political affiliations are nothing like religious affiliations, our profiling of "communists" during the Cold War basically became an excuse to play morality police that didn't even end up keeping the Soviets' dirty fingers out of our state secrets.