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That is a thing I've never asserted.
To restore my initial argument: the very same presence of nuclear power plants makes the world more fragile, because eliminating a percentage of the population (say, a third as with the Black Plague or 90% as with smallpox in South America) runs the risk of eliminating people who know how to run and maintain the plants, thereby creating multiple nuclear accidents.
I would argue that if you suddenly lose something on the order of half your population, nuclear plant accidents are not going to be the thing you should worry about.
Besides, nuclear plants are over-engineered and have multiple automatic failsafe systems. If most of the humans stop coming, the reactors will shut down by themselves (or the remaining few humans will shut them down).
The only really big nuclear reactor accident (Chernobyl) happened because the operators deliberately disabled a whole lot of safety systems which got in the way of something they wanted to do.