In Japan, TEPCO demonstrated a long-running, stunning disregard for safety that led to the Fukashima disaster (and it was not Japan's first nuclear power plant disaster, either): https://en.wikipedia.org/wiki/Fukushima_nuclear_disaster#Pri...
And as a reminder, Chernobyl happened because a bunch of engineers were basically engaged in a dick-measuring contest, likely to satisfy some apparatchik.
I'd say the world's nuclear power programs have demonstrated extensively that humans as a whole can't handle the responsibilities, and now we have numerous, much safer alternatives.
It's an absolute miracle we haven't had an accidental detonation of a nuclear weapon near a population center given bombs have even been released from planes, in some cases with multiple safety systems satisfied - and that the permissive action link system was almost completely bypassed by petulant air force commanders who had weapons set to (I wish I were making this up) codes of all zeros.
With the energy usage of non-western countries exploding quickly this could be a major hinderance to stopping climate change if all prosperous nations go all-in on nuclear and discourage other countries from doing so because of the risk.
A non realistic scenario tbh, it's very unlikely that e.g. germany will construct new nuclear power plants and a lot of not-very-stable countries already use nuclear power as we're seeing right now.
Russia has used its reactors to produce materials to conduct political assassinations on foreign soil, which have ended up injuring and contaminating many innocent people.