1. Once a person has contracted corprus the other beasts dont attack them (I know, in game when you get it they still do....but ignore that)
2. They normally have the drums that keeps them civil.
But I do agree....seems a bit silly.....though if you remember, you can send a Vivec lady (Tanusea Veloth) there because she contracted corprus, and because she is at such an early stage she lives in the upstairs area.....so many that area in the Corprusariam is just for advanced, but still sane patients.