Richard Dawkins says it outright. One wonders why so few other atheists are speaking out in the same way. Note that he does not hasten to qualify his comment by saying, "Islamic extremism" or "radical Islam."
Dawkins: "I'm reasonably optimistic in America and Europe. I'm pessimistic about the Islamic world. I regard Islam as one of the great evils in the world, and I fear that we have a very difficult struggle there."
Narrator: "Why is it more problematic than Christianity, for instance?"
RD: "There is a belief that every word of the Koran is literally true, and there's a kind of closemindedness which is, I think, less present in the former Christendom, perhaps because we've had long - I don't know quite why - but there's more of a historical tradition of questioning. There are people in the Islamic world who simply say, 'Islam is right, and we are going to impose our will.' There's an asymmetry. I think in a way we are being too nice. I think that it's possible to be naively overoptimistic, and if you reach out to people who have absolutely no intention of reaching back to you, then you may be disillusioned.