IDK about the idiot part.  The fact that the site closed without notification is pretty damning evidence that the site was not legit from the get go.  Any legit site is going to know ahead of time that it's going to close and will give users ample notice.  It's the non-legit sites that just come and go mysteriously without warning and without reason.  And since it's now a KNOWN FACT that this was a non-legit site,  theft of coins is not a stretch.  It's VERY possible and actually VERY LIKELY that the site did steal from this user.  ESPECIALLY if they were having solvency problems.  Steal from one to pay the many........