[Mikeb85]

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 of information, just like a snowball is simply an accumulation of snowflakes.

If our technology, accumulated information and institutions were wiped out tomorrow, we'd be back in the stone age, and it would take us another 5000 years to 'progress' back to where we are now.

We've been able to observe it in the past too, many civilizations were destroyed and the result was their descendants were much less sophisticated technologically. 'Progress' does not change people, and people will easily revert to base behaviour.

[ef4]

But if all our institutions and capital were wiped out, it would be appropriate for our behaviors to revert. That just proves that humans are extremely adaptable to changes in environment.

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.