What you seem to be saying is that good parents can mitigate the damage done to children in public schools. Undoubtedly, that is true. However, why not avoid the damage to begin with. Congrats on the new gks. Twins?
Unfortunately there are many people who are not in a financial position to enroll their children in private school, or who are unable to home-school. We fall into both these categories. Thus, we supplement education at home the best we can. Thus far it is working well.