That's just it: parents are letting teachers, professors, and Hollywood write the script. There are so many college-aged/professional school aged kids who support homosexual unions and haven't even BEGUN to think about the sociological changes that will occur to the framework of family.
So few even remotely consider the fact that what is being done is altering marriage as the basis of family structure to some nebulous fulfillment of personal happiness and love. That much just blows my mind. And this sadly includes many a College Republican, as well.
If anyone's sending a child to school or college, it better be a Christian one. Otherwise, as you said, their "education" will include this agenda.
And even then they sure better know the school's policies for Biblical principles.