@Wetrix
Aren't all morals invented for self-preservation and other selfish reasons? Be kind to others - said someone who wanted everyone to be kind to him. So, let's say the concept of good is a survival mechanism, then a concept of evil is a counterweight for it to work - a list of what not to do of you want to survive as a species.

Different societies (or goverments, or autocratic rulers) needed different tools to control the people. That's where morals and religions come into play.
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