Bustr, i think you've read too far into the situation. Explaining the biological and neurological reasons for a
tendency is one thing. But then you've gone and tried to use it to explain, and to some extent justify, why people do things in game.
And really, it sounds a lot like the "everybodys a winner!" mentality thats been attacking society like a tumor in recent years. I mean you've essentially said "Its ok, you're just geneticaly and neruologically pusthed towards a tendency to horde. Don't bother trying to improve, its not your fault!

".
And really, we (as in society) should under no circumstances and in no situation be forwarding that idiotic idea. If they are physically incapable of improving, then, and only then, should we stop pushing them to improve. If someone is underpreforming, they should not be told "its ok, just try your best". Rather, they should be told "Its ok, you're just starting out with a disadvantage. If you really want to do better, you can do XYZ to help you improve".
As to the coward/squad-bashing thing, I think thats only true to an extent. Theres rarely a squad that doesn't get along with at least ONE other squad in the game.