I wonder if there was any debate among the al-Qaeda cell as to whether or not they should claim responsibility. I mean, he failed completely and blew up his ass in the process, most terrorist groups probably wouldn't want to be known as "the one with the guy who blew up his ass".
Good news: If someone stuffs their ass full of explosives they're not going to kill anyone besides themselves.
Bad news: Many Americans are easily terrified cowards and react to threats like a flock of chickens, and will use this to pass laws.
I thought shoving Semtex up a terrorists ass and detonating it was the kind of thing Saddam Hussein used to do out in the desert to put the Fear of Iraq into the Taliban.
The proper response is "We dare the Taliban leaders to try this. Not even God would dare make such a true sacrifice." Lots of uncomfortable glances around the Cave HQ.