I submit that it is Elon's individual ego that drives him to strive for and achieve these goals. Its just that his goals seem broader to you than Arnie's. And to a large extent they are. But the goals are driven by his ego, and not some mumbo jumbo altruistic feeling.
Uh... it's complicated. And that ("it's complicated") is something one needs to repeat often when talking about psychology with computer folks. ;)
Yes, it's his ego driving him. No, I did not imply he's a saint. Yes, his goals are more broad.
Careful with judgements like this, since they are often projections of your own self. In other words, you saw in my statements things that irritate you, and responded to those projections.
And finally, joining and equating mumbo-jumbo with altruism is already very revealing in terms of your own attitude. ;)
And, with that, the armchair psychologist is signing off.
I don't believe that is a driving factor. Is it that hard to believe someone would want to do something soo ambitious just because they want the future to be better? I would say that's the default desire of a human being until it's beaten out of them by society.