If they have political motivations, it's right wing terrorism, regardless of whether they are part of some larger group. Even if they are "crazy mentally ill" because you don't see "crazy mentally ill" shootings from "left wing terrorism" like you do from the right.

Yes, 9/11, really. It was right wing terrorism, and I only included it due to the severity of the attack since it was over 20 years ago now. But if we want to keep going further, I could. This is no where near an exhaustive list.

You can stick your head in the sand if you want, and pretend that this isn't an issue, and that everything is fake news, but you would be fooling yourself.