Anyway, do we actually know any properties of herd immunity for covid, like how strong the post-infection immune response is, and how long it lasts? We risk disaster if we run that experiment in the wild based only on a sense that it will work out ok. If it goes wrong, someone will be blamed. People don’t seem to be concerned about body bags in the abstract, but when they see them locally the pitchforks come out.
Scarily, we don’t! and some scary reports out of South Korea suggest some people can have the virus reactivated. WE don’t know exactly what’s going on in those cases; its possible they test negative falsely. But still, it’s scary. This virus is really a bastard!!!
I think the 2-years of social distancing though faces the same issue. We don’t know how long immunity lasts, but we’d assume it’s stronger initially and wanes over the course of 18 months to 2 years. Do we really want to drag out the time when people are infected so that people could conceivably be infected twice?