I have two young daughters, one 7 and the other 8. The 7 year old is the sweetest most kind person I know, she lets her older sister have all the toys. At school, she gives the other kids all her book fair money, she is outspoken, energetic and the most active, outspoken person in her class. The teacher loves her. She looks just like a mini Reese Witherspoon.
The 8 year old is greedy. She claims all the toys, she keeps to herself at school, and is actually showing signs of being a hoarder. Which scares me a little honestly, because my dads uncle was a full blown hoarder, and we emptied his house after he passed, and I think it should have been in the guinness book of world records.
...Anyways, the 7 year old has absolutely no self-preservation qualities. She will literally skip in front of a car, and seems oblivious to potential dangers. The older one is very aware of potential dangers.
My hypothesis is that greediness is good for individuals because it is self-preserving. Kindness is bad foe individuals because it is self-sacrificing.
With governance, I would choose a conservative, self-preserving one. Thus, the greedier the politician, the better
Self-interest and altruism should be balanced, ideally. It's not feasible in the long-run to be selfish, because eventually you will run out of friends and people to support you when you need it, and you'll likely find yourself lonely and miserable. We're a social species that has evolved to thrive through cooperation and interdependence. Of course, this means you also cannot be completely selfless otherwise it will likely end up hurting you (the airplane oxygen mask principle).