Shibez, this was my take on the conclusions too. It seems that in the end, while nature exerts an extraordinary force which can be seen even in mannerisms and preferences, the manifestation of certain nature-destined trait can in fact be great modified by how that child is raised.
By the time we come to the end of the movie, it's pretty much pointed out that while all three very likely inherited the same capacity for troubled mental health - indeed, as infants they all displayed distress in their behaviors - the parenting style of Eddy's adoptive parents did make a negative impact on that one boy, driving him toward the detrimental path he took.
Unfortunately, back in those days, there wasn't much sensitivity out there regarding "parenting styles" at all, and even if Eddy's father had known that this boy may need a more careful approach in his upbringing, that was the era when a man like that father would have dismissed that stuff as BS and parented the same anyway. It wasn't an enlightened era.
I also think that the propensity toward mental illness in many of these children may have also been exacerbated by the very act of separating them from not only a birth mother but from each other, too. It's like a chicken and egg dilemma - might not most of these kids already have been set up for disturbance by that early trauma itself? Already all three of them were banging their heads in their cribs, and I have no doubt that being separated from each other was traumatic right from the get-go. There are also studies about the bad effects of a child being separated from its birth mother bond.
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