Anecdotal "evidence" is routinely discounted by discerning observers, and for good reason. A well-constructed empirical study allows for generalization within given parameters, including exceptions. An anecdote contributes nothing useful, in itself, by comparison.
The "socialization" issue has always been recognized as a red herring raised by the public school lobby, (not that exceptions cannot occur.)
What about idiot parents? Most of the parents I meet today I wouldn't trust with an ant farm.