Ugh, how awful. Hope we find out more soon about why this happened.
Also, it should show people that right-wing and left-wing (especially ultra far right conservatism, really)
If I think of the most prominent attacks on US government buildings, at least, I think of 9/11, then before that, Oklahoma City, then before that, the Weather Underground. So I'm not sure any group is especially
dangerous. Extremists of any stripe, religious, right, left, etc, will sometimes turn violent.