The Kirk shooter so far seems to have no connections to anti-facist groups. “right wing” violence kills far more people than “left wing”. Of course, most left wing people and most right wing people have nothing to do with any of this violence.
Designating drug gangs and then domestic organizations as “terrorist” organizations could lead to persecuting political opponents not because they are somehow funding, or a part of, a terrorist organization, but because they are political opponents.