You can't wipe a continent out with the worst case coal plant failure. A reactor going critical and exploding, however "impossible" would do just that. Look at the Saudi plant going up. It is jokingly referred to as "a car with no seatbelts".
People naturally overweight low frequency high impact events like a nuclear meltdown but drastically undervalue high frequency low impact events. Someone dying early because they lived too close to a coal plant doesn’t make the news, but in terms of actual human impact it trounces nuclear’s impact by multiple orders of magnitude.