Well lets define selfish, dictionary.com has it as:
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concerned chiefly or only with yourself
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If everyone was only concerned with oneself in every single action they took how would that affect society. Could society in fact function under those circumstances? I beleive not. If a selfish act harms no one then its fine, possibly even good.
Evil according to dictionary.com:
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Causing ruin, injury, or pain; harmful
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Lots of selfish acts however do impact on others though otherwise there would be no self interest to worry about.