There is never any justification for Mob violence. Antifa is about the same as the 1960's so called "Free Speech" movement. As usual with pinkos ,it meant the opposite. Their goal was to smash "The System". These Antifa punks are the same.
if they only opposed them as well as actual fascists and racists, I'd have little problem with them. the fact is they are anti any right wing and have attacked marines and minorities in the name of "anti-facsism".
If it were up to me, I'd put them in giants stadium, give them all the bottles and bats they wanted and charge tickets for the melee.