A more careful reading of my comment, “…You've got to assign a healthy dose of blame to the parents here…” would reveal that I’m not speculating that this blame is at the 100% level.
Had I intended to take the absolute position I would have used a different set of words to convey that thought. One possibility would have been to substitute the word: ‘the’ for the words: ‘a healthy dose of’ in my comment above.
"...Do you have kids?..."
Three. All top drawer performers.
"...What do you think of those families where one child out of 3 or 5 becomes the black sheep? Do you blame the parents? Just curious...
There are certainly cases where the most plausible explanation for a given child’s failure to develop normally would appear to fall into the ‘Bad Seed’ category. Most failures, however, involve parental failure of one sort or another.
It’s important to note that a parent or parents can fail, miserably, and be completely oblivious to their failure. The mere belief that you’ve been a ‘good parent’ does not automatically make it so. In cases where there is evidence suggesting otherwise (an errant child) at least some degree of parental failure is the most likely cause of the child’s failure to develop correctly.