Hasn't Human nature itself been crafted by evolutionary forces? It is conceivable that our ancestors that were more laid back and content were more likely to be out competed by those who were hungry for power and prestige.
In fact, as an example, isn't there some often quoted statistic about half a percentage of all living humans having descended from Genghis Khan?
In fact, as an example, isn't there some often quoted statistic about half a percentage of all living humans having descended from Genghis Khan?