You might get incredibly lucky and bexome a billionaire without being a sociopath.

There's no way to stay a billionaire without being one, as long as there's abject poverty and suffering.

i think your observation is consistent with the giving pledge thing of warren buffett and others, that they accrued massive wealth but want to give it away.

Yeah, that's the thing; once you have a billion dollars, you are set for many lifetimes of extremely comfortable living. Allowing a single person to suffer while you have more wealth than you can spend in a dozen (or more) lifetimes is pretty cruel. I mean, I don't really see how it is significantly different than hoarding.

I've never had billions of dollars and realistically I probably won't ever have billions of dollars, but I would certainly like to think that I'd keep enough for myself to keep myself thoroughly entertained, and then give the rest away somehow.

Of course, I've never been tested with this. Maybe if I was gifted billions of dollars I'd be as evil as the rest of the billionaires.