There's two kinds of violence, the structured kind and the transgressive kind. The first variety is fighting performed within a pre-defined context to settle status conflicts. The second variety violates social norms. The first kind is overt and the second kind is covert. If you want to use political violence you have to master the second kind, where 99% of the problem is avoiding legal sanction. It's really not important whether you can beat someone in a fist or knife fight, but can you murder their pets and sabotage their brake lines without being spotted by the neighbors? And do you know how to stay out of prison if you are caught?
What impresses me about antifa is that even though they may be laughably incompetent in all other respects, they understand these things at a gut level which conservatives do not. I remember watching one video where a left wing protester threw the first punch and when asked about it all of her comrades were climbing all over themselves to lie to police and say that they saw nothing. Or, when you point a camera at them, they reflexively try to obscure its view with their flags.
Thrasymachus used a ring of invisibility to make his point, not horizontal punching power.
CarlKrauch