They Say One Out of Every 10 People is a Descendant of Genghis Khan

It is surprising to me that for the majority of human life as we know it, it was much rarer to find a man who had never taken another's life than it was to find a man who had.

Perhaps we are only alive now because we are the progeny of the most successful murderers of all time. In that case, are we pacifists not the outsiders, and those imprisoned for violent crime the norm?