>>9489010 lb
>Nobody has ever found any constants in human action
That is like saying no two objects are identical because they are not EXACTLY alike. There is plenty of research that shows people behave in patterns or mannerisms and that patterns can be passed between generations without social contact. Just because humans are not machines and can use free to act against inborn instincts does not mean those instincts and traits do not have a very real impact on how a person acts.
The fact we can go against things that we are born with and that our experiences and thoughts can change our genetic makeup is what makes this life so interesting. But to deny how our physical body impacts who we are and what we can and can not do is to ignore at least half the equation.