"US Muslims struggle with how they
should condemn extremism"
Well, bless their hearts. It would be helpful if we are to understand their angst, to personalize the issue or adjust the frame for a more familiar perspective.
Americans struggle with how they should condemn incest.
Americans in 1941 struggle with how they should condemn the attack on Pearl Harbor.
Americans struggle with how they should condemn slavery.
Americans struggle with how they should condemn anti-Muslim genocide.
Well, I think I've learned a little something from this exercise, primarily that something inherently evil as beheading innocents, random mass murder, and the premeditated destruction of conquered civilizations, should qualify for condemnation with no moral struggling at all. And to the extent you find it difficult to condemn evil, then that is the extent to which you are complicit and indeed, a facilitator.