For anything you consider to be evil I can give you an example of a society from sometime in history where it was not considered evil. Killing a newborn? StreetHazard answered that one.
We know what right and wrong by thinking about the effects and seeing the consequences of a particular rule. Let's say there were no morals to start with, you may try stealing from a neighbor because hey, you want what he has. The next day he steals something from you. Eventually you both may figure out that just agreeing not to steal from eachother would be a lot easier for both of you and thus a moral rule is born. Of course these things take time. Think of how long it took us to agree that slavery was wrong.





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