The only thing you can do is give your children a very strong foundation and warn them about what will happen before they go to college.
You're not even allowed to say anything against homosexuality in my college.
I noticed when I was getting my associate's degree at another college that nearly every class was some kind of political indoctrination and if you had conservative, or Christian, or even any sort of true, moral faith, then you were made to feel as if you were backward, barbaric, stupid, and way behind the times.