[ElProximo]

Originally Posted by coolestrock

aside from shiabash in bb7,,,,dave is the first mentally ill person bb have allowed to stay in the house,,,,,he's obviously conned the producers into thinking he is a normal person,,,,,,however he is quite clearly delusional and should be seen by doctors asap

The only explanation for you is a 'con' and a con so diabolical it duped psychiatrists at BB.
The other explanation is that he is not mentally ill. Wait. He is not 'pathological' and it doesn't interfere with his ability to carry out daily life.

Having said that, plenty of people believe not only in were-apes but believe there were millions upon billions of them transforming from ape-like creatures into humans over millions of days.
They have never seen any such thing and even take ape skeletons, line them up in order and pick the 'most human' one and call it their great grandmother.
Most are 'sane'.