True, but the Muslim terrorists actually specifically target civilians to make their points, while most of these militia-type wackos go after those actually working for the government they detest. Not to say that's right, but it would be uncommon for a Tim McVeigh type to bomb an airliner. While it's true that he killed a lot of civilians in the OKC Murrah federal building, he actually believed he was hurting the government (since it was a federal building), and didn't realize that there was a daycare center there.
Even these two nutjobs told everyone to GTFO of Walmart so they wouldn't get hurt/killed. They went after two cops, and the third guy was shot because he tried to stop them. Again, not defending them at all, but they were different than your typical Muslim terrorist who wants to kill as many Americans as possible.