This is why we need to teach our kids values and the reasons for those values. All of my kids went to excellent public schools, where the emphasis was on education instead of liberal indoctrination. All of them came out as conservatives with decent values, completely unharmed and to some extent strengthened by their low-level exposure to the amoral perspective of America's enemies.
Those “excellent public schools” are becoming fewer and farther between. Outside of those few school districts people who send their kids to public school are ipso facto engaging in child abuse and culture abuse.