Earlier quoted context omitted.
You're missing the point here. Ideally the 3rd gen kids will grow up to realize their 2nd gen parents made reasonable decisions even though they disagreed as kids, just as the cliché says (and like so many testimonials out there). e.g. If gen 1 only used witty condescending remarks to teach their children that they're dumb, then 2nd gen can realize that this severely damages their kids' self-esteem. If gen 2 recobers…
Take any family line. What generation are they at? Shouldn’t all bad parenting be weeded out by now?
Some don't. It may be that the parents overcorrect and never teach their kids right/wrong, or it could just be the kid being a problem, or any number of other issues.