I mean think about life. It's so arbitrary sometimes. We're living in the universe where Donald Trump threw a McDonald's feast at the white house.
Why then, couldn't we live in the universe where someone like you gets just enough power to make the world a better place. What if by some clerical error like in Blank Check, you get all of Jeff Bezos' money and divide it evenly among every Amazon worker?
So much of life is unpredictable. You could be at the right place and right time to make an unselfish choice.
Wanting the world to be a better place is in my own self-interest and will help everyone I care about, along with millions (billions?) of other people. So while it's not "really" selfless, I would still consider it good and noble.
Aye, I could do with that...