Manhattan Project factoid--there were two groups working on a bomb. One was all about U-232--the other...Plutonium.Yes, they should be allowed...they of all countries should be allowed since they are the only country in history who had nukes used against them.....
Takes quite a bit of imperialistic audacity to dictate to them what they can and can't have; with our track record of being the only country to use them....and to do it for no reason but to show off...
The first bomb..Hiroshima, was a U-232 bomb. The 2nd plutonium. One of each was made. When the Japanese did not immediately surrender, not that they could have possibly done so, given the realities of both the Japanese govt. but also the difficulty of communication , the 2nd bomb was dropped. While it was a near miss..the force of the explosion...much bigger yield than the 1st, cemented Plutonium as the way to go.