I think it's reasonable to want to have a space that's free from people that defend authoritarian regimes. From my perspective, at least, 196 has always been a more anarchist-oriented space, and I think it makes sense to try to preserve that.
I'd also make the distinction that they are not banned from this forum, in the same way that libs are not banned from posting on their instance -- but those that post there are generally met with hostility, and that preserves the character of their space. I don't see why we shouldn't do the same.