There's a book written by a former Muslim prof (forget the name at the moment) at the big Muslim university in Cairo, who is now a convert to Christianity. These people CAN be reached, but not by pussyfooting around. They just see that as weakness. PC will kill us just as surely as bombs.
Usually, but
There was a guy on the radio a few days back discussing our methods of persuasion. He told of one detainee who at the end of weeks of intense questioning abruptly told all.
He was later asked Why?
He said "When I realized that was the worst you were going to do to me, I recognized that I was on the wrong side"...