The game you are late to is in accusing the family of being uncooperative.
Well, your claim that the family is not cooperating is untrue. There were times when LE felt they were not getting full cooperation, but that is not the current condition. The reasons for them not cooperating - and btw that is how LE worded it, not the family - seem somewhat justified. If my daughter was missing, but I was being held in a room repeatedly being yelled at and accused of killing my daughter for 8+ hours, yeah, I think I might begin to get "uncooperative." And yes, if I'd told LE that I know my daughter and she wouldn't jump in a lake but if she did she could swim out of it, and that I'd talked to people at the lake who never saw anyone swimming there, who never saw the water disturbed, and I knew my daughter left the house happy and didn't have intentions to run away with her cousin, but then LE continued to ignore my thoughts and kept telling me that my daughter was probably in the lake, or wandering the woods miles from where her bike was found, etc, I can see where I might get frustrated with LE, and they might label me as "uncooperative."
And I totally believe that if someone/thing you loved was missing, that you would see LE as a help and as a savior. But, as I've said, Misty and Dan don't hold the same view of LE as you do. You've not walked a mile in their shoes, you've not experienced the same sides of LE as they have. What YOU would do, how YOU would react, is completely irrelevant. I would bet that as of July 12th, they viewed LE as an enemy, right or wrong. And I know for a fact that they have been viewed, by LE and by complete strangers, as people who clearly must have had some hand in this disappearance.
Remember, the focus is the CHILDREN, not THEM.
I'm not trying to argue with you. We are both seeking the same result. But I live in this town, I know the family, I know many of their friends. I can tell you that the people who know them are not "shocked" at their reactions. Are they more selfish than you are? Probably. Are they showing more selfishness since their daughters' disappearance than they did before it? No.
To pin blame on the family, because one of them doesn't seem as sad as you think she should, or because they didn't respond to LE the same way you think you would, is wrong on many levels, IMO.
Do I think that Dan and Misty's criminal past has bearing? Absolutely. Do I think they know where their children are? Absolutely not. Would I handle things the same way they are? Maybe, maybe not.