It's the chapter right before this one (436) on pg 15. He basically wants to create his wmd and distribute it to the villages for their own use. He believes that this will instill fear of "nuclear warfare" (well, it's not really a nuke, but you get the idea) and that will prevent war from becoming commonplace, sort of like the system we have now with the U.S., Russia, China, etc. none would dare to nuke the other out of fear of being nuked right back. And in the event that war does break out, the resulting devastation will be so immense, that the participants would be unable to sustain open warfare for any extended periods of time, or face annihilation. He never said anything about wanting power for himself, or wanting slaves. Nor does he seek to wipe out any country in particular, so the Hitler/Stalin analogy isn't technically accurate.
He knows full well that he is not immortal, and that he cannot personally maintain control of all those different countries forever and ever, which is why he wants to leave his weapon behind, to ensure that even after his death, his idea of "peace" will always remain. So I wouldn't say he is "heartless" or "power hungry" int he tradition sense, someone like Orochimaru, who couldn't care less about wars or the fate of the rest of the world, would fit those better. There's a difference between being heartless, and being morally misguided, but with good intentions. I'd say he falls more under the latter. basically, this entire scheme of his is Kishimoto trying to make a (rather obvious) parallel to the dangers of nuclear warfare.