So? Just because a few people did something unacceptable doesn't all of them are like this. A while back a child got killed named Cannon Hinnant by a black person for no reason does that mean we should label all blacks as a terrorist?
Also i think you’re making a false equivalence here. There is a not insignificant fraction of them willing to be violent because because they either don’t (or don’t want to) understand how democracy works.
I think it’s fine to lump those people together as domestic terrorists.