Not defending ANTIFA's actions in that sense at all, they should be held accountable (and yes I did partake in whataboutisms, at the time, when I should have known better).
It's unfortunately the nature of mob mentality, mob's rarely end up in positive actions. The tearing down of the monument and kicking, spitting on it was reminiscent of Saddam's monument being torn down, but we'd like to think that the west is a lot more rational and civil than the middle east. But all that was displayed, that when it gets down to the core of the situation humans are the same, and they act like spoilt rotten children when in a mob.
With the weekend's incidents though, it wasn't just ANTIFA counter-protesting, I'm sure there were normal everyday citizens, who were concerned about white nationalism, who partook in the counter protest. There's no real statistic that says how many of the crowd were antifa and how responsible antifa were for the violence, it was just a muddled mob mentality mess.
As I said previously, if police, from video review, can identify the perpetrators then by all means they should come down with the full force of the law.