Well, the Communists actually were a threat, and they had infiltrated our government, so I wouldn’t say the “Red Scare” was irrational - or that the fear of Muslims infiltrating is irrational. They are doing it and in fact they have already installed themselves in high positions in virtually every part of the US government and, increasingly, the media.
We must stop using “soft” language and tactics out of a fear to offend someone but not go as far a J. Edgar Hoover's absolute power approach.
Yes, Muslims are everywhere but we need to seriously look at what they are doing and saying and latch onto those who expouse views incongruent with our values. Got to be careful here but also be vigilant.