Well, it's not like I've written a dissertation on this and have very complex arguments, so you might be right.
But what I've noticed in a broader sense is that in these types of fictional worlds, you often have the bare-chested, dark-skinned people doing barbarous things and making gutural noises. Sometimes being downright evil without much reason (because they actually enjoy it or whatever), and they mostly don't have real '3D' characters but are a plot device for violence and other uncivilized actions. They're so cookie cutter that you could see any number of them killed without really feeling anything.
On the other side, you have the Northern European bunch, some of whom can be quite evil too, but usually for complex geopolitical reasons or other more human motivations. In other words, they don't do evil things just for fun or because they don't know better, but because they think they're actually doing the right thing, somehow. Their characters are usually much more developed.
Maybe it's just like this because of the way our evolved brains work, and the target audience can't help but identify with a certain 'tribe'. I don't know.