Altruisn and the Selfish genes and Darwin

I think that in a sense the most pesimist about altruism is Charles Darwin with his theory about natural selection. In his theory where Darwin explain the natural selection that only the fittest survives, and only the stronger will be able to live or to get the better food. This theory would over thrown the idea of altruism, and that we humans do good things for others for the exchange of nothing. Acoording to Darwin human beings would not act in a altruistic way because we would be too worry about our ownselves and trying to survive as the strongestof our kind.