Thoreau applies Occam's razor:
[T]he simplest explanation for why W. has stayed out of this [and said nothing about Islamophobic rhetoric by the GOP] is that he doesn’t strongly oppose Islamophobia. He may not be an Islamophobe himself, but he clearly doesn’t get too worked up over Islamophobia.
He's also too co-opted by the far right to say anything. If the grandson of Prescott Bush treated torture of prisoners as a no-brainer, and has said in public that he would do it again, why on earth would he take a stand on something like demonization of American Muslims?