This was what Marcuse was getting at in "Repressive Tolerance". Some views deserve free expression. Others do not. If you give free expression to all perspectives, the vile ones will spread until you can't control them anymore, and then you're no longer a tolerant society but a repressive one.
We have the means and now the will to identify vile speech online and shut it down at the network level.
Can we think of some good reasons for suppression of communication? I can name several (disruption of ongoing stochastic terrorism, disruption of immediate harassment process, failure to comply with the TOS of a private corporation voluntarily doing business with the offending party, use of network compromising service provision for third parties in the same system), and many of them apply to the KF situation.
I could cite examples of harassment and "stochastic terrorism" on Twitter, reddit, Facebook, etc, but I doubt I need to.
KF either can't or won't keep its house in order, and at this point, the can't-won't difference is immaterial. I welcome someone making a solid run at providing another channel alongside Twitter / FB / et al, but this ain't it.
Think of all the harassment directed at Kyle Rittenhouse, or the Covington Catholic kids, or just Republicans generally, on reddit and Twitter. Harassment was featured on the front page.
That isn't a small problem that the moderators are unaware of; it's an ideological belief that certain harassment is acceptable.
FWIW, I've gotten kicked from FB far more often for vitriolic criticism of the right than the left. At least to my eye, they try to steer an even keel... If people are seeing more Republicans get snagged, I think it's because of their own social circle (because filter bubbles are pretty thick these days).
"First they came for the Nazis" is how World War II could be described (1), and with the exception of a few misguided sympathizers the story ends well with the destruction of their power structure and hanging of their leadership.
Probably worth noting that among the reasons KF just lost their newest DDoS protector is that many Russians are understandably sensitive to Nazi sympathizing, even "for the lulz".
(1) One could even argue that hesitating to come for the Nazis sooner was a significant mistake in the international community that allowed the severity of the War and the atrocities that occurred in it.