The bitter truth is: they don't want peace for everyone; They want the monopoly of being scary and the legitimacy of being scary. They themselves must remain strong and nuclear, and of course scary, and limit others - even countries that seek only peaceful nuclear energy - with a false image of a "nuclear threat".
A peace where nuclear powers see their weapons as a guarantee of liberation and security, but the same logic calls others a threat, not peace, which is a monopoly of power based on righteousness.
A system that does not see the enjoyment of security and peace as a right for everyone, instead of being a peacekeeper, it encourages the control of a certain group.