If you pair radical actions with the term "god", bombs are going to happen, especially when you have self proclaimed "splinter cells" that finally feel that they are doing something of some importance (I aint talking Afghani peeps here, I am talking about Americans).

When you have a nation that is divided, you will have those that blame the opposition for everything and vise versa... yep, you guessed it, they may use bombs.

Political unrest can result in fat guys in tri-corn hats gathering in groups or the smug opposition that live by the assumption that they are more intelligent than others. These guys go nuts and make bombs too.

All in all, a ton of "terrorist" attacks have been by Americans on Americans, you can blame RWWJ, Al Qaeda, George Bush, Vietnam, Fox News, Glen Beck, Obamas Secret Socialist Plan, Aliens, Alex Tribecks Moustache (that is still at large), Hippies, The Chinese... you get the picture...

It ain't a Muslim thing, or a brown man thing or any other "thing" than a bunch of fucked up individuals that spend enough time convincing themselves they right, they believe it.

but go ahead, blame Fox News or LIndsay Lohan or something... that's not the problem at all.