Senior Bush is responsible for this mess.
I assume you mean GWB, not his father.
Sure, after 911, GWB tried to hard to get the public to buy into "Islam means peace." He even had a young Anwar Al-Alwaki speaking at an Islam unity forum.
But, I blame Obama the most. He was the one who set up, by EO, a "Welcoming Communities" scheme which smoothed the transition from incoming at immigration to Muslim immigrant packed communities in selected cities, and their access to government welfare.