There is a lot of emphasis in the film on how Openheimer was motivated to create the bomb exclusively because of being at war with Germany. So while the idea of secret groups developing weapons is unquestionably explored it is justified by the extreme circumstances.

Personally I didn't believe much of it. Propaganda comes in many forms. Films being a major one. I am in the camp that weapons of mass destruction don't even exist. At least not in the public realm. Much more effective at controlling the people is the fear of such weapons. And this fear is still being used today with great effect.

I wrote a post about this subject last year in fact: @samstonehill/the-nuclear-scam-exposed