Hmmm, well what he's saying is well documented, it's called being competitive. In any kind of serious competition the opponent(s) are reduced to an adversary to be overcome, by any means allowed within the competition. It's just like two boxers going at it, they go in there with the intention of beating the other guy to a pulp to collect money and prestige, not to revel in shared humanity.
Likewise in war effort is made through propaganda to demonize the enemy to make them easier to kill. A lot of the garbage we believe about World War II was because the allied powers didn't want their soldiers seeing the Germans as being people that just happened to be on the other side, doing what they thought were right. Hence the the war department concocting things like "human flesh lampshades" (look it up) and similar things which weren't debunked until decades after the fact.
The problem here is that left wing sentiment is a bit too strong within society, at it's core a lot of these studies come down to the attitude about pursueing "self validation" with the youth rather than competition. Both wings are involved due to the great scapegoat video games make to avoid dealing with real issues, but this is the core of the arguements being made. Aggression, competitiveness, and viewing other people as obstacles to be overcome when they are in your way, are not entirely bad things, especially not in a capitalist society. Granted it's possible to take such things too far (like everything) but I think the problem is that there is a definate movement to try and wean all of this out of the youth as a form of social engineering.
It's sort of like violence in general. Violence is not an inherantly bad thing, indeed people are inherantly violent as a survival mechanism, our aggression, violence, and competitiveness are what lead humans to becoming the dominant force on the planet, if it wasn't for these traits we wouldn't be here in a society capable of even contemplating this right now. I'm not great at articulating it, but saying "violence is bad" is wrong, one does have to learn to control those impulses, and of course it's possible to take competitiveness to the point of becoming a sociopath, what you need is a balance somewhere in the middle.
All told I actually don't disagree with this guy's findings, I just disagree with his interpetation of them, what they mean, and whether or not it's a bad thing.