They were once leaders in Science, there are now very few Muslim Nobel Prize winners. Islam is tearing itself apart. There's too much violence perpetrated the world over in the name of Islam. It's an unacceptable problem and threat for the world community to have to put up with. There needs to be more solidarity among peaceful Muslims and they should deal with the problem, otherwise it's too easy to spread the propaganda that it's a "them" against "us" thing, recruiting more angry, disillusioned and/or ignorant Muslims.
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"They were once leaders in Science, "
Actually, much of the contemporary evidence that is coming out about the past, we have strong evidence to now assume that the revelations in the muslim world only happened during the heights of their military conquests. They captured new land and with that the knowledge of those they conquered.
You'll also notice, when they were moderated by the surrounding empires that didn't allow them to expand further, they quickly disintegrated and went backwards even worse. Muhammad himself started 63 military campaigns during his life and personally beheaded people. What the "extremist" muslims are doing today wouldn't be much different0