Ya my whole thing is that there are to many variables, And no numbers or real way to test the percentage this apply's to. Basic underlying instinct can be molded from birth, If there is care and compassion shown a baby will feel and learn from that and actually develop chemicaly different than a baby in an orphanage who is in the crib crying all day with no comfort. The more stressed out Society becomes the more parenting changes.
Study's have shown stress reduces brain cells and changes physiology, we use to get stressed like when zebras were chased by lions but now we have no off switch a zebra after running and getting away goes back to eating grass, we as human are in a corrosive bath of stress hormones all day and night for years Mortgage , traffic jam, Kids, work ect ect
point is humans physiology and behavior change with the times and circumstances and are passed on to our seeds. Hence Heredity and I know some/many piece of shit parents who have passed along more than eye,skin,color but chemistry of nervous system leading to everything from depression, behavior, disease ect
So the question is how many have this so called underlying good at heart internal voice an how many are like the ones I seen at the club two weeks ago stomping on dudes head after he was already KO's with no remorse? To me study apply s to some, Ideally it would apply to all.