Bombings and other political violence are already illegal.
Are we going to classify every single variations of the political beliefs of every domestic terrorists even if they are shared by millions of others law abiding citizens?
It's almost always a radicalized individual who does these things. If you want to extend the net to the people who radicalized them, you can but you should be aware that also works to the people who radicalized the Kirk shooter, the the would be Trump assassins (mostly the alive one, the dead one just seems like a nut) and Mangione.
Are we going to classify every single variations of the political beliefs of every domestic terrorists even if they are shared by millions of others law abiding citizens?