This is an unfair and untrue interpretation. I cannot speak for Dan and Misti, I don't know them, and I only barely know Drew, have never met Heather that I can recall (although she looks so familiar to me). AFAIK, Drew and Heather have always been active in church. To hear them referencing their faith is nothing new, and from what I've seen/heard the same goes for their children. Dan and Misti, as I understand it, have been more than forthcoming with the problems in their past, recent and distant, and ALL members of both families, by accounts of LE and reporters, has been of cooperation. The only anomaly is when Dan grew tired of being accused and left an interview, from what I understand.
I hate what I've seen meth do to this state. I've been personally affected, with close family and friends having gotten caught in meth's grip. There surely are drug-filled and violent homes in the area, but we read about them, we know about them. You simply cannot keep secrets like that for too long in a town this size, even in Waterloo. I've seen children who've grown up in violent, drug-filled homes, and neither Elizabeth nor Lyric - or any of the other children in the families - displays evidence of such.