[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.