Earlier quoted context omitted.
> Our nature is no less violent, our circumstances are merely better. Even if that's true, it has the same effect in the end. "Put people in a better environment, and they will behave better" is a radical, pro-progress statement that would have been unrecognizable to most societies. We're so infected with the progress meme that even people here arguing against it keep implicitly granting some of its premises.
How about this: take people out of a 'good' environment, and put them in a bad one, and they'll revert to primitive behaviour. This is something that has been observable even in recent times. In recent conflicts people have committed incredibly base behaviour, including cannibalism... http://documentarystorm.com/the-cannibal-warlords-liberia/ Technological 'progress' is not really progress, it's just an accumulation…
Which state shows our "true nature"? I would argue the concept is meaningless. Our current state is just as natural as any other.
To argue otherwise, you need to make theological assertions about humans being supernatural. A city is no less natural than a beehive, which is no less natural than a mountain.