The smallpox virus now exists only in a laboratory. There is no herd immunity to it. It's very dangerous and would have, my estimate, a 70% fatality rate. It's highly infectious. There is an effective vaccination against it so this won't arise but AIBU to think that, in the absence of a vaccine, it wouldn't be
appropriate for the government to say 'don't worry we'll just let it level out and see what happens'.