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in my opinion i think that we feel guilt because when we do feel guilty it is usualy because we killed/hurt something/someone, we stole something, we lied, we had an affair,etc.
I disagree. All of the behaviors you mentioned can confer a selective benefit on the perpetrator. Game theory or competition theory would suggest that some asocial (ethically defined) are beneficial but ONLY if the level of say cheating is low and the level of fair play etc. is much higher. Sort of like mimicry. If everyone lies, cheats, kills then there is no society. Perhaps feelings of guilt are a social mechanism for insuring that those behaviors are rare and thus society can function...sort of.