It's kind of sad that everyone seams to think that nuclear power is the same as nuclear weapons, and the used stuff could be interchanged without any problems,

It's kind of sad that everyone seams to think that nuclear power is the same as nuclear weapons, and the used stuff could be interchanged without any problems, and that a commercial nuclear power-station can produce weapon grade stuff without any problems. Is it just disinterest? Or the thinking that Nuclear is bad overall?