truly altruistic actions are abundant on a daily basis, disproving the thesis that human motivation is systematically selfish by nature.
This doesn't prove that motivation is selfish by nature. What if humans learned to be less selfish? What if it is part of culture?
Testing children doesn't help either because people get morevselfish as we get older. And children aren't as altruistic as it seems at first blush. They compete with siblings fpr the attention and resources of their siblings.

