Knowing how to build a pretty decent atomic bomb comes with the territory.
Now don't take this the wrong way, but soomewhere I seem to remember some supervillain origin story that started out with some genius type of guy who was jilted by a woman (or women), him snapping, and ended up with the creation some sort of super-weapon which became a thing of power for him.
Not that I would actually build an atom bomb in my basement or anything. But you know, it's not actually that hard. The equivalent of 10,000 tons of dynamite can be pulled from less than 4kg of plutonium. And oddly, refined plutonium isn't that hard to get. It's much harder to get the high explosives needed to start the reaction, but it's possible to purchase the component chemicals online and actually make the explosives. The chemistry is pretty basic carbon, nitrogen, hydrogen and oxygen stuff.
Not that I'd actually build an atom bomb in my basement or anything. Not even just as an intellectual exercise.
I'm just sayin'.