There's no unified "anti-fascist" movement, but the common theme among the self-described anti-fascists I know is the belief that physical violence has a legitimate place in democratic processes.
Frankly they remind me of a line by Nietzsche about staring too long into an abyss.
> the belief that physical violence has a legitimate place in democratic processes.
That's not exactly the point, though. We are not in a democratic process (unless by democracy you mean giving away powers to congress), and our society is very violent towards the most vulnerable segments of it.
Do you think giving back just a tiny portion of that daily violence we face is immoral or wrong? How is it justified for people to threaten us with guns if we don't pay rent to some arbitrary landlord or to detain us if we dare steal food for basic survival, yet attacking bank windows or punching an actual genocidal nazi in the face is seen as violent?!
Communists and anarchists who are willing to use force against their opponents. (this is based on both media reports and first-hand experiences in Portland, Oregon)
If you mean against the ruling class threatening a million species and the neonazis promoting eradication of many branches of our species, then yes i'm certainly advocating to stop these people by any means necessary.
Frankly they remind me of a line by Nietzsche about staring too long into an abyss.