An argument can be made that all actions people take are for their own self-interest. Even things like helping the community is done for reciprocal benefits for yourself plus the general increase in respect.
Another point is that if all people just act for their own self-interest, they will have a better life themselves, and if everyone does the same, some sort of proper balance will be achieved.
I have been having some occasional discussions with my friends over this. I personally disagree, but would love to hear what others have to say. Feel free to discuss!
War is the least interesting place to look for heros but it is undeniable there, read stories of medal of honor recipients and tell me they pulled off some insane shit because of “self interest”.
No, virtually every gift bestowed upon you by this world is a direct or indirect product of people making the strange choice to act in the interests of the greater good against ridiculous odds when the easier choice was screaming at them to take it. That is how it always begins :)