The reason for all the deviant behavior is that when you have dozens of children with multiple mothers and an essentially absent father is that they grow up with a very skewed understanding of what a real father or mother is. After all, how can they know? They’ve got to share the guy with so many other children that none of them know him, and their real mother is often one of many. Bonding often doesn’t happen, “daddy” often plays favorites with the wives, the children often engage in incest at an extremely early age, and as the boys grow up, there is no place for them in a polygamist society because the women are all taken or spoken for, so they are run out of town. These are the “lost boys” of the FLDS. http://www.childbrides.org/boys.html
I’m not saying this happens in every family, but with many of them, yes.