If we use worst case for everything then we should treat all coal mining as setting literally every coal vein on fire and unextinguishable a la Centralia, PA.

If we use worst case for everything then we should treat all coal mining as setting literally every coal vein on fire and unextinguishable a la Centralia, PA. Absolute worst case isn't a very sane way of setting assumptions or we would bar all surgery because of the risk of it killing people.