In some ways I think you are on the right track...ie. adaptive behaviour (ie. Darwinism) requires us to render some attributes to the forefront and diminish the usefulnes of others.
Even predetermined genetic diseases ie. allergies to peanuts, cancer etc. are present it seems because of our response and familial response in the past to toxins. Whether on a pysichological level or not we learn to respond to these illnesses (so to speak).
Clearly one spouse dies quickly after another due to losing the will to live without the other present...or Reese's monkeys die due to lack of affection (Psych 101).
If the mind is the control centre which elicits either a proactive will to get better or a command to wallow in our sorrow (ie pain), perhaps there is a correlation to why some get better or have higher pain thresholds.
I think your thoughts are valid....after all ....we are what we eat, we reap what we sow..the apple doesn't fall far from the tree are sayings all related to behavioural responses to situations and clearly we have the power to change them....ie the abuser whose child is loving and caring in his future family, the child who fairs well with an education and successful future after living a horridly poor, uninspired upbringing.
Maybe we all need to take this a little more seriously

Nero