There are definately aspects of the letter that should have been better written. There are aspects of slut-shaming in the letter, and I think this section:
We don’t encourage our daughters to walk around naked in it because it makes them prey for animals and less than animals does have victim blaming connotations (not for Miley Cyrus, but for rape/sexual assult victims in general, which is worse).
Your body is for you and your boyfriend is awful on so many levels. A person's body belongs to them alone, but they can chose to share it with anyone they want to.
I think it's just the way the letter reads- that no woman could ever chose to use her sexuality in her own right- doesn't sit well with me. Surely women have the right to chose how they dress. You shouldn't be barred from dressing a certain way or behaving a certain way that isn't directly hurting anyone just because some people might leer at you.
It's not really about Miley Cyrus. It's about other young women who might read that letter, and feel like they have to behave a certain way, or they deserve to face harassment and worse from men.
Either she should write a more direct attack on those she feels are directly responsible for exploiting Miley Cyrus, or she should acknowledge that it is possible for a young woman to feel positive about being attractive and possitive about her sexuality, and that doesn't have to be a bad thing.
To be honest, she just sounds very pearl-clutchy, middle class and out of touch.