Paradox of heroism

It's interesting how in the quest for selflessness in trying to help another person(s), we are indirectly doing it in a self serving way, to satisfy our need to belong. This need to belong may perhaps be argued as a core component in our psyche under Maslow's hierarchy of needs. Looking around us, it is clear that people exhibit a want to identify with a certain group, from the kid who wants to dress cool so that he can go out with his friends, to the simple housewife wanting to 'keep up with the Jones', we cannot deny that group bias is there. Even in nature, animals form up in communities and hunting packs. Seldom do we find pure individualism around us. In this sense, it is about time we started to question whether there is such a thing such as 'true' selflessness in this universe. Why do we do what we do? Is there something else behind all those good deeds that we attempt to do on a everyday basis. Just for the sake of humankind? Really, that's it?