Circumstantial evidence has a way of accumulating. Joran admits being the last one to see Natalee before her disappearance. He has been caught in numerous lies and is evidently not answering all the investigator's questions.
PVDS's behavior towards Beth & Jug is most incriminating, IMO. When PVDS repeatedly kept telling Joran to shut up and not say anything and told the Twitty's, "You're not in America", when they were asking them questions, reeks of a cover-up. Rather than being helpful, his behavior wasn't normal. In fact, he was down right hostile and arrogant (Joran too).
Then, his demeanor completely changed when Beth & Greta went to the VDS house. PVDS could hardly communicate except for his profuse sweating. Beth picked up on his strange behavior and evidently has even more suspicions & information she is not sharing with the public.
Sounds like circumstantial evidence won't win a conviction in Aruba like it can in the U.S., but my gut is screaming the VDSs are guilty as hell. It makes getting those cell & text message records and finding Natalee's body imperative.
Rather than being helpful, his behavior wasn't normal.
You're probably correct. If eleven horn-honking, perturbed people showed up outside my house at 3 a.m. & demanded to speak to my 17 YO son, they'd have been greeted with Ole' Bess.