A theory dealing with the origin of ethics in humankind. It states that humans are social animals that have certain genetically determined traits that promote social interaction. Evolution has provided us with our ethics because, if we held vastly different values, we would be killed off promptly. For example, empathy is a good human trait which helps us prevent conflict. Since this trait can be seen even in infants (babies cry in empathy sometimes when they see other babies crying), empathy must be somewhat genetically programmed into us. The sensitivities that the majority of people have built into them is what is known as "ethical" or "moral." This theory is quite new, so it has no official set canon. Being applied in varying ways, this theory has quite a range of subsets. One extreme applies the theory to our whole being, making humans sound like robots with preprogrammed instructions. The other group applies it in only a general way, leaving room for free will.

Sociobiology has the same problems that the Social Contract theory has: It does not account for our intuitive response to things like genocide, nor does it account for great heroes who defy the social norms.

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