After All Those Reveals, Who's the REAL Villain on American Horror Story: 1984?

At first Rita appears to be the resident nurse at Camp Redwood, but it turns out she's actually a deranged psychologist who let Mr. Jingles loose from the asylum and tied up the real Rita to take her place at the camp. Dr. Donna Chambers — that's her real name — wants to study Mr. Jingles in his natural killer habitat and is intent on having him wipe everyone out for her research's sake. Dr. Chambers is so obsessed with serial killers that she probably won't even mind finding out Mr. Jingles didn't start out as a killer. As long as Jingles is killing now, she'll probably be happy to continue supporting him.