Why wouldn't I want to shelter my kids? - No one else is going to! As a parent I plan to shelter my kids for as long as possible. But, if for some reason I feel the need for them to be exposed to the perversion and wickedness of the world, I can order cable, put a television in their bedrooms and let them watch TV during the day where all of the humanists and homos of Hollywood can pervert their minds and destroy their character just as the public school would do.
Of course living in America, it is almost unavoidable to be exposed to filth no matter where you go. But, while my kids are young, I will do my best to preserve their innocence because that's my job as a parent! My children know what kind of sick culture we live in and they know it is destructive. There is no way I would hand them over to the government so they can be dumbed down, corrupted, molested, and robbed of their childhood for the sake of 'socialization'!
Public education does not have some magical formula for people to deal with the 'real world'. In fact I believe that the school environment puts kids at a disadvantage. There is no other circumstance in 'real life' where the conditions of a public school are duplicated.