Imagine two worlds. One world's inhabitants all act with the philosophy, "What can I do that will benefit only me and mine?" They constantly fight against everyone--competing even internally, against their own conflicting desires--and cooperate with their own kith and kin only inasmuch as it allows them to conspire against those farther from them. The other world's inhabitants act with the philosophy, "What can I do that will benefit everyone in the world?" They cooperate, share, and give of themselves for others.
Over a long enough time period, what happens to each world?