But then people don't know a thing about isotopes, fertile and fissile nuclei, or what actually goes into a bomb. The reactors that produced the plutonium used

But then people don't know a thing about isotopes, fertile and fissile nuclei, or what actually goes into a bomb. The reactors that produced the plutonium used in warheads largely came from specialised reactors designed for this purpose only. You cannot get the same stuff out of civilian reactors.