Yep. The majority of previous attacks of this kind — bombs to kill innocents at the Atlanta Olympics, Oklahoma City, and the MLK march in Spokane come immediately to mind — have been from American right-wing extremists. It’s too soon to say whether this one is too, but to assume it’s from overseas is not in keeping with history. And to state that attacking people overseas will prevent them from attacking us here is rubbish. It promotes it. Do you remember how WE responded to 9/11? Is there any reason to think foreigners are so completely different from us? Start down that road, and you’ll start thinking the torture in Abu Graibh and rights violations in Guantanamo make us safer.