"Our development of intelligence genes "probably occurred in a
  world where every individual was exposed to nature's raw
  selective mechanisms on a daily basis," he said, but the same
  pressures do not apply today. " Eh. Nice theory but he's full of
  crap. It's idealizing a version of the myth of the "noble
  savage". It's a part of our cultural heritage to want to "return
  to a better time". Started in the 19th century among, well,
  anthropologists and popularized in the fiction of the day.
  There's peoples in areas of the world barely touched by
  civilization for the past 6000 years, except maybe for the last
  50 years or so, and they're NO DIFFERENT FROM US. He's full of
  shit. Sorry. There'd be evidence of "more intelligent genes"
  among the people who weren't in civilized contact and WERE still
  fighting. "Raw selective mechanisms"? What the heck is that?
  He's dreaming. Maybe I'm wrong. But it seems like a really
  romanticized view of an untestable past. That's also known as
  fables. I expect him to write a book that will get popular
  though, advocating a return-to-nature thing or people fighting
  in cages or something, I dunno tongue emoticon