I appreciate your response. All the claims I have made are based by hard evidence. You can google anything you wish.

Also the fact that some other psychological mechanisms exist within humans or even if the phenomenon appears among other animals, this doesn't negate what I said. It might as well complement it. Otherwise we will be chasing the chicken/egg equation.

Kin selection is an accepted theory as well but biological evolution precedes by far any social one. This is just my opinion though. I tend to favor more the group selection theories over the selfish gene ones.