Kneejerk conflation of Obama and Bush could be the most ridiculous talking point to come out of the mouths of liberals in the post-Bush era. Without the benefit of logic or historical context, it's merely a cheap crowd-pleaser used by anyone seeking the accolades of similarly nearsighted sycophants.
I believe that we collectively decided, without quite admitting it to ourselves, that somebody, somewhere in the world, had to die for 9/11, and we didn't really care whether they'd had anything to do with it or who they were, so long as they were brown-skinned and worshiped Allah and lived in the Middle East.