Depending on which journals you've picked up in recent months, early humans were either peace-loving softies or war-mongering buffoons.
Which theory is to be believed?
A little bit of both, says one archaeologist, who warns against making generalizations when it comes to our long and varied prehistory.
Pretty good article actually. It mentions how some of these theories get popularized and spread among the general culture (Kubrick's Killer Apes). Even when there is legitimate evidence for that theory, it's not the whole story, but once something gets ingrained in the popular culture it's tough to dislodge it.