Civilization has only come along in the last few hundred generations, far too recent to effect significant mutational change. So civilization has not molded us to its requirements, but rather, we have molded it to fit our prehistoric tribal needs. We Really Are Some animals, such as bears, spend their lives mostly alone. Bears, though, are powerful animals with giant claws. A bear can take care of himself in the wild.
People are relatively defenseless, and a man alone in the wild finds it tough to survive.
He needs a tribe. To function in a tribal environment, we had to learn to do certain things. As with all survival requirements, these have become drives . Communication involves two things - getting what was said and knowing which person said it. We must create a way in our minds to tell people apart.