You are saying that people have the right to promote an ideology that promotes genocide.
Yes.
Why don't you see that defending an ideology based on hate is defending that viewpoint?
Defending someone's right to speak is not the same as defending their ideology or their viewpoint. This is a big part of the foundational principle of the United States. I realize Substack isn't the government, and the principles of informed self-government are a lot more complex than "just let everyone say whatever," but to me it's an important principle. It's the same reason the ACLU used to defend Nazis and the KKK and their right to have rallies.
It's a huge conversation honestly, and the Nazis are such an extreme example that people of good faith can disagree. In real-world space, I agree with you and I agree with the Nazi bar analogy. But in actually strictly-speech environment... Honestly? To cut to the chase, I think being exposed to viewpoints that are wrong is good for people. If every time you see speech that's evil, you freak the fuck out and demand that someone come and take it away because it can't be allowed, (a) you'll deprive others of the opportunity to see the wrong stuff and learn unpleasant truths about the evil that exists around them, and exercise their powers of judgement to determine it's evil for themselves (b) you'll get in that habit and start demanding that someone e.g. take Dave Chappelle away because you misunderstood a joke of his. That causes a lot more harm than the Nazis on Substack did.
That's my opinion. I'm actually trying not to get in an argument with you about it, because you clearly don't agree with me, and honestly you don't have to. I'm just laying out what I think.