Honestly I am mystified that people do not understand that, the norm, statistics, expected behavior, most likely response, universal response do not mean everyone and always. It is that simple. Humans, though predictable are not pre-programmed robots that will respond exactly the same to every situation. We all bring our nature, nurture and experiences to every situation.
There is not a single reputable psychological/psychiatric/behavioral study that will state unequivocally that everyone will respond in the exact same manner to a fluid or static situation. There are reasons it is called the normal response and not the only response . Even self-preservation is not an absolute universal action that can be expected from every human being.
The branches of study or practice of which you speak recognize this simple truth of the unique human psyche and it is figured in to their assessment of the whole of humanity. Study of human behavior is part science (and with brain mapping it is getting more scientific) but mostly it is still an art.
So well put. I wish it had been me who had posted it.