Generally it does not. Makes a lot of people upset if things don’t work out, sure.

Agree. Usually it doesn't blow up but sometimes does. When it does, all of the squirrels in the area get 3 eyes and 5 legs.

More accurately they suffer defects and die.

Then there is Chernobyl which now has healthier and more diverse wildlife than much of the world because humans have evacuated.

Chernobyl was good then?

In the micro, no, see the part about death.

In the macro, it created a nature preserve that humans will barely visit, won't hunt in, won't deforest; and requires no active enforcement to keep that way.

So positive NPV in a sense?

You have a strange, anti human morality.

Yeah and planes crash and it's spectacular, but they're still the safest means of transportation by far.

Planes are fast though. Even if less safe that cars we would still use them.

And nuclear is cheap. It is literally free energy.

If someone gifts you the facility and the staff work for free then maybe.

How often does such incident occur?

Not often but sometimes.