Teenagers who spend a year before going to college working -- in a restaurant, for a moving company, at an office -- will mature far more than they would after a year at college. And maturity is an inoculation against leftism.
If your home is Jewish, Catholic, Protestant or Mormon, another option for the year after high school is to have your child devote a year to studying religion in some formal setting. The more your child knows, lives and adheres to the principles of any of these religions, the less likely he or she will convert to Leftism, which has been the most dynamic religion of the last hundred years. For example, it is a fundamental belief of each of these Judeo-Christian religions that the root of evil is within the evildoer. But it is a fundamental belief of leftism that people murder, steal and rape overwhelmingly because of outside influences such as poverty and racism. The moment your child understands that people who commit evil are responsible-- not poverty or racism -- they cannot be a leftist.
Fourth, don't be preoccupied with instilling high self-esteem in your child. It is the left that believes that self-esteem is a child's right, something that parents and society owe children. Conservatives believe that everyone, including children, must earn self-esteem. Indeed, the belief in earning -- rather than in being given -- is conservative.
Fifth, teach character. The left has essentially defined a good person as one who holds progressive social positions -- on race, the environment, taxes, health care, etc. That is why the left, including the feminist left, could so adore Bill Clinton who regularly used his positions of power to take advantage of women: He held progressive positions.
If your child recycles or walks five kilometers on behalf of breast cancer, that is lovely. But if your child refuses to cheat on tests or befriends an unpopular kid at school, that is character. And teaching that definition of character is more often done in a conservative (usually a religiously conservative) context.
It is not all that hard to produce a son or daughter able to withstand left-wing indoctrination. You just have to understand that it doesn't happen automatically.
Dennis Prager is a SRN radio show host, contributing columnist for Townhall.com and author of his newest book, “The Ten Commandments: Still the Best Moral Code.”