This is just not thinking clearly. There are bad things that are asymmetric in character, dramatically easier to do than to mitigate. There’s no antidote or vaccine to nuclear weapons.

This is exactly the thinking that has characterized responses to new sources of power through history, and has been consistently used to excuse hoarding of that power. In the end, enlightenment thinking has largely won out in the western world, and society has prospered as a result.

Centralizing power is dangerous and leads to power struggles and instability.

It is not easy to create weapons. Why do you think the physical and legal barriers that exist today that prevent you from acquiring equipment and creating nuclear weapons will go away when everyone becomes smarter?