Nature vs. Nurture; The tale of the Elevator and the Thermostat

Imagine an elevator with three buttons that summon it to the first, second or third floor of a building.  The elevator's physical form (it's shape, including the 3 buttons) comprises its mechanical "nature".  When someone presses the second floor button, that experience counts as its "nurture".

Certainly, two elevators with this same configuration will not act the same way.  One elevator may be summoned to the third floor, while the other may remain neglected at the first floor.  They will exhibit different behaviors, leading to different destinations.  So it seems that different "nurture" (pressing different buttons) leads to an important difference between the elevators.  Yet even if 100% of the variability in the behavior is due to unique environmental factors, this does not mean the behavior is environmentally caused.

If an elevator could talk, it would say "I am free to do anything I choose -- and I choose to go up and down.  It's my choice, of my own free will."

Now imagine a thermostat set at 70 degrees (F).  If the environment became cooler, the thermostat would turn on the heater.  Once the environment heated up, the thermostat would turn off the heater.  The behavior of the thermostat over time seems to be completely driven by the environment.  Does "nurture" play the key role?

What's wrong with these examples?

Clearly the elevator's buttons are designed with an "expectation" to be pushed, with the effect of summoning the elevator to a new destination.  The buttons respond to very specific experiences.  The elevator does not respond to hot or cold, light or dark, or a loud scream.  Those experiences cannot move it.  It is designed to be affected by very specific experiences.

In the same way, the thermostat is built to recognize a very specific environment (changes in temperature), and not be affected by other environmental stimuli.

Humans are also made of matter, but we're a lot more complex than elevators and thermostats.  Still, even if we're built from thousands of tiny mechanical pieces, the result is the same in principle.

I believe human behavior and variation is (nearly) 100% nature, and 0% nurture, because the only nurture we are capable of responding to must be part of our very design.  (You can compare this with the philosophy of Henrik Walter).  Two elevators on different floors are not different.  The differences in outcome are based on planned branching points in the design itself.  They are the same - in the same way that a penny may land heads or tails yet still be the same penny!