Muslim recruiters thrive on campus for the same reasons as cult recruiters and leftist academics.
The modern university is the place to find insecure young people questioning everything that they believe in and unsure of what to do when their impulse to tear down everything does not fulfill their need for something to believe in.
The skeptic is never for real. There he stands, cocktail in hand, left arm draped languorously on one end of the mantelpiece, telling you that he can't be sure of anything, not even of his own existence. I'll give you my secret method of demolishing universal skepticism in four words. Whisper to him: "Your fly is open." If he thinks knowledge is so all-fired impossible, why does he always look? — James Sire (from, The Universe Next Door)