Mmkay, I am just going to say it. I might be flamed for this but, well, that's the way it goes.
The obsession with horror movies and mass murderers is being pretty sensationalized right now. I am sure once NG gets a hold of this, it is all she will talk about. I personally do not find it odd that there were printed material of serial killers in the home. I do wonder about their taste in music with the Insane Clown Posse but anyways. If they had a computer at home, I bet BD would not have printed it off. I bet they would just be reading it on a computer.
I guess if this is really odd, then I am extremely odd. I habitually read obituaries, browse Medical Examiner records online, have weird Google searches that I won't even get into, read about mass murders, look at crime scene photos, read about forensics, view morgue photos and try to find names for the unidentified etc. etc.
I admit a lot of other things are hinky with this couple, but I just tend to believe the horror films, printed content and masks and such are just NOT hinky.