Thanks for this post. Honestly not certain I will make it through the whole thing, but I've read a fair bit so far and it's bang on.

“Natural immunity does not exist for novel viruses.”
I actually haven't seen that said, but I think I see where that person went wrong. When they say "natural immunity" what they mean is "passive natural immunity"... like being immune to a pathogen because your mother (who breastfed you) had immunity to it. If they had said that, they would have been more correct.
But when we say natural immunity, we're talking about active natural immunity, where our B and T cells are involved to fight the pathogen, and "remember" it in case they see it again. That most certainly does exist for novel viruses, and all viruses.
People really need to understand their terms before making such statements!
I would know, as would my wife and son. We had Covid in Feb-Apr 2020. My son wasn't even 6 months old yet, and therefore did not have an immune system, but we got him through it and by spring he was able to beat it. I'm a bit older and already have "long Covid" since 2016 (all the same symptoms but obviously not that diagnosis), so I did have some lingering side effects long after the initial infection. But we haven't had any issues for well over a year. Not even a cold. We take C, D, Zinc, and some other supplements, and we eat a healthy plant based diet. We see others like us regularly for socialization and activism. None of them have been sick lately either. None of us mask, none of us are vaccinated, none of us distance or isolate. I don't know how long this immunity lasts, but we're perfectly fine at the moment. Covid is supposedly making the rounds again in nursing homes and such, but that's what the flu does, it picks off people near death. Sad but true, always been that way. Those of us who had Covid are immune, at least for now. And if we get exposed again, which we probably already have, we'll either not notice it at all, or just have a much milder version than last time, even if it's has "mutated" since then.
We're the healthy ones. For them to come at us to remove that natural immunity is, as you say, illogical, immoral, and criminal.