This is an apples-to-oranges comparison.
Consider what a nuclear disaster (like Chernobyl) costs: the total price of that disaster is however many statistical lives are lost (look up "value of a statistical life" if you don't know what I'm talking about) plus the total current and future potential economic value of the land on which the disaster occurred. That number is insanely high.
The cost of a commercial airplane crash can also be extremely high (for example, if it ends up hitting tower filled with people) – but typically, it doesn't completely decimate the value of the land upon which the accident occurs and all surrounding natural resources. Those resources are recoverable. That's why we can (by comparison) YOLO with an aircraft, but not with a nuclear reactor.