A) Please show me where I have done that, and
B) Please provide any sort of CONCRETE proof to the idea that their lifestyle contributed to the child's disappearance.
I understand being critical of the lifestyle, I don't understand trying to place blame on the parents based on that fact.
Simply the fact that they may have allowed strangers (I don't buy the strangers theory, from the swingers that I have known in my life, they don't allow strangers into their home) into their house would make anyone who has allowed service techs, movers, painters, wall paper hangers, delivery people, pest control techs, potential home buyers, sales people, etc, etc, etc. into their homes "bad" parents as well.
"Concrete" proof--how about common sense? If you bring home a bunch of barflies you meet during the course of bar-crawling--inviting same barflies for a drug/booze/sex party--what are the chances that among them will be some "undesirables" or at the very least, a lurking carrier of a sexually transmitted disease (if not lice, fleas, and ticks). People who inhabit the "underbelly of society" are more likely to harbor perverts than, let's say, at the church social. True, there might be a perv at the church social, but chances are far, far less.
I'm sure lots of us would be amazed at what we could drag in from some sleazy bar at 2 a.m.--mostly because most of us wouldn't dream of trying such a stupid stunt. Probably the best thing about this is, none of the trash they brought home happened to be axe murderers, at least not for that evening.