If an accident happens, it won’t be the end of the world, at worst a relatively limited area will need to be closed to humans for a temporary time.
Globally it is not a big deal, compare that to cooking the entrie planet, I’d gladly take a few more exclusion zones if that enavled us to get rid of all coal plants.
There is also another point to this, nature is thriving in the Chernobyl exclusion zone.