Human morality or one's concerns with others' well-being is affected by many factors. Chiefly among them are the following:
1) One's biological heritage.
2) One's social and psychological environment.
3) The intrincate relationship between (1) and (2).
As a repply to Stanley, I woud say that what is moral or good in certain contexts may judged to be immoral and bad in other contexts. However, in all societies and countries there exists the idea of good and bad, right and wrong, moral and immoral. The same is true concerning the concepts of true and false, beautiful and ugly.
It appears that humans are born with capacities for love, cooperation, and the inclination to create and follow rules and social norms. They are also born with capacities for selfishness, aggression, and antisocial behavior. Different circumstances activate the different capacities throughout development in childhood and throughout life. Early experience, moral training, psychological traumas, the surrounding social norms and many more influences contribute to how a person deals with any given situation, whether prosocially or selfishly.