We all have a "fascist" gene. The gene pool of humanity as a whole is very small, which lead researches to believe that we descend from a very small group of h

We all have a "fascist" gene. The gene pool of humanity as a whole is very small, which lead researches to believe that we descend from a very small group of humans, maybe 10,000 or so, when our ancestors came out of Africa. That does not mean that humanity was obliterated by some sort of calamity and the population reduced to those small numbers. Seems it is more plausible that a small group of humans developed a new trait, that somehow let them to collaborate beyond family/clan. That gene gave them the ability to identify with others at a higher level, belonging to the same group/nation and fight for them without even "knowing" them all. Hence, that small 10,000 people group progressively exterminated the other groups.