Cost is massive indeed, but even in extreme cases like in Chernobyl, it will be offset to non-existence compared to the gains we will reap in the long run if we master this technology.

Remember, that nuclear is still in its early stages. Newer and better designs emerge and we're even still researching fusion.

Early cars were like a death sentence in Texas. But that didn't stop engineers from improving and making them better. What if they said after the first crash - "Screw it, back to horses and carts, this stuff is too dangerous."