I think this whole thing is also about not thinking and putting their child at risk. Not checking on your children for close to 12 hours straight (assuming the parents' story is true), even after the alarms were tripped and the door was open is DEFINITELY NOT THINKING AND NOW THEIR CHILD IS GONE! I pity them for how they are probably kicking themselves over this. If they love their children (and I'm sure they do) they're going to go through that night over and over and over in their heads and they are going to wish with all their hearts that they had done something differently.
I'll tell you one thing, if they were swingers (and I don't doubt it, seeing as how they won't deny it), I think that their swinging days are now over.
Lack of denial is hardly proof of guilt, Clinton denied having anything to do with Lewinsky. They may be swingers they may not.. either way, I am not going to condemn them as bad parents even if they were. If they did something to put their children at risk, related to being swingers or not, then I will judge those acts as to whether or not they were.
Time will tell with this case, and I pray that this child and all missing children are found safe.