Because future generations have to safehold and not misuse extremely destructive knowledge. We have a world where North Korea has nuclear weapons, but do they have the ethics to use them responsibly, understanding their full potential? Do the other countries with nuclear bombs have that ethical responsibility, especially over generations? Cuz that big red button is going to be around for a while.

Yes, I would say the threat of dying in nuclear hell fire (if you were lucky) a bit of a burden.