That's not supported by physics. Even at the worst - if the other reactor had somehow also melted down, that still wouldn't have caused a major climate change event. It would have been absolutely terrible, regionally, but not globally. Nuclear reactors aren't atomic bombs.
I don’t understand. Plenty of climate change related developments are regional. See: the increasingly devastating hurricanes forming in the Gulf of Mexico. Not every single thing that we attribute to climate change has to span the entire globe.
Not creating nuclear power plants because you're afraid of some bombs is good reasoning?
What about the millions of deaths to fossil fuels every year? Are they better than the nuclear accidents we had?
I don't think good reasoning is why they felt that nuclear power was bad.