The only thing Sarah preached on was abortion.. yes, she stressed on waiting til marriage, but she did allow birth control teaching to her daughter. In fact, she supported it. But her daughter is a grown woman who chose differently... But she did keep the child! These days, girls like her would just go to abortion clinic.
I believe people should wait til marriage myself. Not easy thing to do. I know some people wait til they found someone they love and care for instead of marriage...Some girls did want to wait til marriage, and when they found someone they love, they figure they are going to get marry anyway so what's the harm? I think Palin's daughter thought so too. But that's where these girls/guys made a mistake.
Anyway, I still support we should still stress on Abstience til marriage.. but I also feel that we should support birth control teaching too... as long as they treat it as a marriage thing . Such as " If you and your spouse do not want to get pregnant on your honeymoon or one of you are not sure if you have HIV and don't want to be stuck with a child and definitely don't want to go through an abortion, here's what you should do" At least the kids will know what to do if they decided not to wait and yet this could send the message to the kids not to go around and have sex especially while they are still in high school.