Because we have robust science to develop vaccines and treatments for COVID (which afaik we do not for the common cold) it makes sense to hinder transmission until that protection is a bit more robust, to spare people the worst effects of a novel pathogen. Precisely so that getting infected repeatedly carries less danger. Technology is a factor evolutionary biology too, one that has been wielded to great effect already, sparing a lot of lives. Given a bit of time and effort, technology might provide vaccines and treatments with sterilizing efficacy.

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