I don't understand what your argument is. I never claimed that it was impossible to develop nuclear weapons if you don't already know how to do it. That every country that has attempted it has succeeded is not the same as "there's a recipe book you can find online that you can just follow to the letter and build your own nuclear bomb, provided you have the resources". If such a book existed it would drastically lower the barrier to build a nuclear bomb, because you could skip the science part and just follow the recipe, certain that it would work. To be clear, such books exist for drug manufacture; they exist neither for semiconductor manufacture nor for WMD manufacture.