I think Dr Cocteau was worse than Simon Phoenix
Phoenix is evil. No argument there at all. But Cocteau wanted to strip people of their free will. Even Phoenix himself thinks this is wrong.
Phoenix is an evil who knows he is evil. He may be a killing, villanous, foul human being, but he's at least honest about how terrible he is. He has no delusions that what he does makes the world better.
Cocteau really believed he was doing the world a service.
To steal from The Dark Knight, Phoenix is just a mad dog. Cocteau let him off the leash.
Never hate your enemies. It affects your judgment. -Michael Corleone