I think what happens, from talking to Mormon friends, is that Mormons are used to a certain amount of discrimination and prejudice from the outside world, it makes them a bit clannish (understandably), and it makes them inclined to over-estimate the likelihood that bad accusations against a fellow "Saint" are born out of prejudice rather than out of the genuine bad acts of some bad person(s) using the Mormon religion as protective camouflage to get away with stuff.
As a Wiccan, I can understand that. You experience a certain amount of discrimination, and when someone of your religion claims discrimination, your initial tendency is to believe them. And a lot of times that initial tendency is right.
I don't think it's that most Mormons think child abuse is okay. I think it's that they don't believe the allegations, for the reasons I just stated, and that the public awareness campaign is the most likely thing to change that over the long term---it's just taking longer to get through the fog.
A good Mormon wouldn't do some of the terrible things some of these places do anymore than a good Christian, a good Buddhist, or a good Wiccan would.
Bad Mormons are cynically playing the Good Mormons like a fiddle. Keep hammering at the truth and sooner or later the Good Mormons will wake up to it.
Timoclea