You may want to watch this video multiple times until you really really get what this means.
Altruism towards everyone – even those no never give back – leads to the demise of the Altruists and the success of the Selfish.
Tribal Altruism (around 4th minute) – not giving anything to the Selfish – leads to the demise of the Selfish, and the success of the tribe.
Pure kin altruism seems to work only when tweaking the simulation. It remains unclear how much this part of the simulation resembles nature.
The YouTube channel is great though.