Let's assume the van dams really didn't know their neighbor, but he's been watching them because they have a pretty little girl with blue eyes and blonde hair. (that is how most sexual predators operate..they stake out their victims and plot the perfect course of action). Lets say that the van dams did have a room built in their garage..similar to the finished wet bar basements that thousands of other parents have. Lets say that he found the perfect opportunity..that night he knew the parents were occupied. It's not like he had to hide in bushes to watch the house. Assuming that's what happened..it's possible that HE HIMSELF called rick roberts and portrayed himself to be a cop..spreading the rumors about swinging lifestyles to put a wrench in the public's perception of the case.
One problem here....the father was home and not occupied, at least not until the mother came home during the wee hours....
Another thing, no one has ever even hinted that the neighbor made calls to anyone regarding spreading rumors. And the rumors have NOT been denied by the VD's. If I was accused of such a lifestyle....not only would I be denying it, but my friends would be coming out of the woodworks vehemently denying it. This hasn't happened with the VD's either. I find that a bit odd, too.