Modern society functions by virtue of a century of businesses cutting margins as thin as possible, trading supply chain fragility for lower labour and capital c

Modern society functions by virtue of a century of businesses cutting margins as thin as possible, trading supply chain fragility for lower labour and capital costs. We're already seeing wild economic issues from a much lower fatality rate disease and the labour shortages/supply chain blockages/etc it has caused. It's very easy to imagine a 30% fatality rate pandemic causing total worldwide economic collapse, causing famine, causing nuclear war, causing photosynthesis to fail, causing a mass extinction exceeding the P-T event. Whether human populations survived is (to be honest), a kind of irrelevant nitpick. The species as a whole was much more robust when large fractions of the population were engaged in subsistence farming and we hadn't disbalanced the atmosphere and doomsday weapons didn't exist. Edit: minor grammar correction