Evolution by natural selection requires a mechanism of inheritance, but the core idea here is just that offspring resemble their parents. Altruism and Morality - Altruism, whether evolutionary or psychological, often strikes people as a good thing. This is often true, but altruism's dark side needs to be held clearly in view if we are to understand the moral dimensions of altruism and also its evolutionary and psychological character. The process of group selection does not eliminate competition from the evolutionary process, but merely transposes it up one level. There is a similar dark side to psychological altruism.
Altruistic motivation can underwrite evil.
The easiest way to see this is to realize that being nice to someone can involve being nasty to third parties. If Alan cheats Beth at cards because he wants to give the money to Carol, we may decide that his dishonesty was altruistically motivated and morally wrong. There is another sort of separation we must effect between altruism and morality. An altruistic concern for specific others is not the same as the acceptance of a general moral principle. If I want my children to prosper, it is a separate question whether I want all children to do well, or think that all parents should help their children.