[chordalkeyboard]

Nuclear weapons present a threat to other people and a threat of violating their property rights, and threats are illegal.

[aaron-santos]

By what measure do you put nuclear weapons on one side and other weapons on the other?

[chordalkeyboard]

The scope of the effects. Firearms can be pointed, explosives have a damage/kill radius. It is not permissible to arrange so that a person is brought within the range of effects of a weapon without their consent.

In the case of explosives, that means you need enough property to contain the effects. In the case of nuclear weapons, it basically requires an entire planet.