Well, maybe we would, and maybe we wouldn’t.
The main problem is that even though we are in ideological alignment with such a person, their presence could make the community less welcoming.
Imagine a protest in the street. A few hundred people with signs. Everyone is on the same side. Then a subset of people take things to the next level. Getting into it with the cops. A little rock throwing maybe. Suddenly, although all the protestors are on the same side, some are still comfortable being there, and many are not. Some get into it, and a bunch run. We don’t necessarily dislike or disagree with the rock throwers, but their actions could cause many to no longer feel safe in the space, and flee.
And so the same principle applies here. We have a situation where people are in complete agreement about wanting inhumane systems to be destroyed. Some of those people start talking about doing stuff that goes far. Maybe someone suggests that physical force should be used against ICE agents or something. Someone who agrees that ICE is evil, might now feel unsafe in a community with this kind of talk going on.
A lot of that talk might be coming from a place of unrealistic masculine power fantasies. White dudes imagining taking down the man. I’m very familiar with it because my brain has imagined it many times. That’s obviously not ok.
Also, it can often overlap with the rule about endangering the community. This is a public space. Everyone in the whole world with unfiltered Internet access can read this post, if they like. There’s nothing to stop law enforcement agencies from reading this and trying to find all of us, not just the author of a post they don’t like. Much like being at a party with drugs and not partaking can still put yourself at risk. I know well the feeling of not going to a party with cool people I like because what is happening at the party makes it not a place that is safe to be.
TL;DR: The balance needs to be between having a party full of the cool people that like it when Richard Spencer gets punched. But also not making the party itself a scary place that any of those people would feel uncomfortable attending.