I am thoroughly fake outraged about this. Loud Noises.
I think the last time I read a Rolling Stone was on a airplane in 1997.
B-Large hit the nail on the head though. The radicalization of a popular, good looking, Westernized kid is what makes the story interesting. Many of us stereotype Islamic extremism into sort of a characterture of the "dirka dirka" shouting bearded guy with an AK-47. The idea behind the cover is to highlight a juxtaposition of that stereotype using the Boston bombing as an example.
Don't like it, don't read it.