There is SOME validity to this kind of thinking, though. In small groups the more primitive societies did tend to be more peaceful amongst themselves. Interpersonal relationships within the tribe tended to be polite and non-violent. So there is something to say for the peaceful primitives. Of course, when you went outside the tribe all bets were off. Intertribal conflicts were common, and brutal. Not so peaceful there.
What I think we see in the development of civilization is, to some extent, an expanding of the concept of tribe. Our tribe is larger now, and in some respects can be considered to be world wide. It's hard to think of the Chinese as the enemy when you can have real-time, head-to-head conversations with Chinese people who are just like you!
On the other hand, interpersonal violence becomes more common, to an extent. Perhaps it's just a function of population: a certain percentage of people are going to lack the empathy which restricts most people from performing criminal acts, so a larger population means a greater number of criminals overall.
Just my thoughts, though. This is way outside my field.