It just hasn't been on as big a scale, and seems to have toned down lately. But fundamentalism never sleeps. Our inner cities have been in a constant state of terror for years. Gun violence has caused residents of urban areas to be afraid to be outdoors after dark. The number of gun deaths in this country is shameful and unexcuseable, and the NRA is bound and determined to get more guns into more hands.
Combat medics train in inner city emergency rooms.
So, whether or not terrorists have any good reason to target the United States, we mostly don't have any idea of why they think they do. That includes the domestic as well as the foreign ones. If we go about this the wrong way, if more innocent people are killed in the process of our getting even, we could be creating the next round of terrorist attacks. We haven't learned this yet. It's happened before-after the Libya bombing in 1986, Libyan terrorists blew up a U.S. airliner to retaliate.