"Self interest feeds more people than self sacrifice."
James R. Cook
One of the most brilliant propositions in his book, The Wealth of Nations, published in 1776, Adam Smith said that the strength of a free market economy was because of self interest. Do not confuse that with selfishness! He said that the butcher, baker and beer maker provide our dinners because of their self interest.
They want to provide the best product possible so that we, as clients and customers, would want to come back again and again. They do it because we clients and customers provide them a better life style and standard of living as they profit from a continued and growing business relationship.
Isn't that why we all try to do the best job(s) possible? Liberty and freedom always, always work best.