@Kelly- Why is giving only right when you expect nothing (not even a good feeling) in return? It seems to me that it is better that people feel good about giving, otherwise it would almost never happen. Also, if people only ever made each others' lives better at a detriment (if they never gained anything from giving they would actually be making themselves worse off) to their own, it would be a zero-sum game, and there would be a fixed level of misfortune in the world.

The great thing about people giving to each other and helping each other is that it enriches two lives at the same time, unlike many of our actions which further someone's interests at the expense of others'.