Meta-reply: at time of writing your comment is grey enough to be on -2, yet nothing you say is trolling or unhelpful. In fact, your comment contains merely two questions and a supposition. I've seen this on HN particularly for COVID related topics and I don't think it's at all helpful. I reckon very few on here are outright anti-vaxxers in the traditional sense of the term (e.g. given to those implying a link between MMR and autism, etc.) yet these days anyone asking questions that may portray, perhaps merely indirectly, some SARS-CoV-2 prophylactics/treatments in a bad light are downvoted. It's not good for curiosity and doesn't help us collectively get to the truth on matters and I think we can do better as a community.