Well shoot, that made me click on it. I mean I'd cut slack on the presentation style. Most everybody suffers a hit when they have to adapt to the green screen/see through board technology for lectures/presentations. Several things for me. First, none of the four CVs she's talking about are SARS Cov-1 or MERS. The common cold CVs that are globally endemic are different but related to CoV-2, like both hamsters and guinea pigs are mammals. That's why the whole SARS appellation is appended to the other ones. Why do some of the recent outbreak CVs produce respiratory and then systemic hyperinflammation in susceptible people? We know some of the circuitry involved but not what triggers it. Second, when discussing virulence it's important to stress that the effective virulence of a pathogen once its endemic in a population can be different than its intrinsic virulence in an unexposed population. That's where I'd argue with her. We will undoubtably see that with Cov-2, and as I linked the other day, we probably already are. Third, reasonable to say herd immunity = endemic. But the thing is kinetics and path chosen. Through most history the answer has been fast as possible and can that involve some culling of the herd? Damn straight. Like I remember walking around when H5N1 came through and there were all these dead crows. Kind of ghastly. Now the crows are back and, well, they seem on average bigger. Like almost raven size. So when a new virus like CoV-2 emerges in as spectacular a fashion as it did the question is not whether it's going to become endemic or whether we're going to get to herd immunity viewed in that kind of steady state way. There's no avoiding it. The issue is to what extent can we manage or direct that process in a modern technocentric world. Part of its science but, certainly in US, also a clash of social values with those values being reflected through the (increasingly cracked and distorting) lens of politics. And the scientists divvy up along the value spectrum just like everybody else. Like the mask debate in the 1918 flu pandemic. Same issues, but in that case it was the socialists saying "masks bad" and the WW1 mobilized "patriots" organizing sewing circles to make them.