Nor do I, but there is a line of thought that she, as a public figure that stumps with abstinance as a central theme, is acting in a hypocritical manner because she failed to come clean about her own pre-marital activities. I don't agree, but only just barely.
I know what you mean, if she had said "look I did it and it was the wrong thing to do and it's had a long lasting impact on my life, so I'm trying to help you from making the same mistakes I did" it would have been more palatable to me.