What if there were no legal restrictions on possession or production of nuclear materials?

Supposing there were no legal controls over the production and possession of fissionable materials -- usually isotopes of Uranium and Plutonium. Any corporation or individual with sufficient resources could devlop and refine fissionable materials with weapons grade potential for the purpose of developing atomic and thermonuclear explosives. I'm not at all convinced we would destroy ourselves. I think the social taboo against using nuclear explosives for destructive purposes is so intense by this stage, that