True. But I think genocide has been less important during our evolution than you believe it has been. I certainly agree that whole human populations have become regionally extinct at times, but through over-exploitaion of resources and changing climate conditions rather than through direct genocide. I heard something a few weeks ago on the radio some scientist believes humans have become extinct in Europe up to seven times in the past. Most before any new wave of humans entered. Looked briefly on the net for anything but couldn't find it. Maybe you have heard something about it?