I was in the middle of writing a similar comment to OP but I think his point was that on HN, even if someone has a reprehensible view, like those you've outline

I was in the middle of writing a similar comment to OP but I think his point was that on HN, even if someone has a reprehensible view, like those you've outlined, we will debate (or ignore), we may get angry, but we will not harass them or dox them or do anything stupid. We will not set a mob of Twitter followers on them. We will debate or ignore and move on. And I suppose it's good that someone with one of those views feels comfortable enough to voice it here as we are given the opportunity to change their mind through rational discussion. On Twitter they'll either be too scared to discuss it (no opportunity for us to change their opinion) or they'll bring it up, face the mob, and likely their belief will become hardened.