No, it's a matter of assessing risk. Why would you risk infecting your entire population with a novel virus that kills on the order of 1% of all infected, when you can do shutdowns and perform slow reopenings to limit spread below 5% of the population until vaccination?
We should be assuming that immunity doens't last long and basing all policies on that assumption until proven otherwise.
We should be assuming that immunity doens't last long and basing all policies on that assumption until proven otherwise.