I attended an Outdoor Writer's Conference over the weekendand had the pleasure to hear Dr Randall Eaton speak on human nature and why hunt. I was impressed by his take on how hunting and fishing makes us a better society. This link covers the information thta Dr. Eaton shared with us.
IWMC.org - Why Hunting is Good Medicine - Randall L Eaton. It's worth a thorough read. He refers to hunting throughout most of the article but as he says you can remove the word hunting and replace it with fishing as fishing is a form of hunting.