I'm late to this one, but will throw in a few comments.
Even assuming there is "sexual slavery" and 75 year old men laying with 13 year old girls (is that a fact or an allegation?), it's still disturbing in the extreme to see the government tossing all constitutional protections out the door. No, people who are bothered by that are not condoning sexual slavery.
When you look at the big picture, arranged marriages by and large are the norm for the human race, not marriages arranged by hormones like we do it in this country (I've known people who had arranged marriages, they seemed as happy as anyone else). Husbands older than wives are also the norm (and for a very good reason, being able to support a family). Polygamy is hardly unusual for the human race either. And I doubt any of these very normal practices are in violation of any constitutions, state or federal. They may be against laws, but we all know laws are often unconstitutional because there is no penalty for legislators passing unconstitutional laws.
Anyway, I guess I can't see how people get their panties in a bind over these sorts of things. This is 2008 after all.
Particular cases having these features may get into the area of abuse - just like "normal" (for America) marriages may get abusive - but that does not mean all such marriages and practices are that way. There still has to be proof.
Which brings up the legal system. I'm amazed some people still feel one can reliably get justice out of it. I wish those folks luck, but remember there are over two million Americans in jail (most for no good reason), more per capita than any other country, so the system runs on its own logic and I don't think justice is much of a consideration most of the time.
Note there was a famous case in Washington state where a prosecutor arrested a whole church making all sorts of amazing allegations, turned out all false, and there was that Duke thing in NC recently.
Keep in mind child kidnapping, er, I mean, protection agencies get lots of money from the federal government for adopting kids out. Yes, they have a financial incentive, a rather large one, for stealing children. Might be a factor here too.
I no longer believe anything people in government say any more, nor anything reported in the mainstream media. I'm sure they throw in an actual truth now and then for effect, but mostly our ruling class are a bunch of liars. Chances are pretty good this has more to do with the careers of prosecutors and social workers than with abuse, if past cases are any indication.