Better four ears than four rears.
Cases of polydactyl cats are not infrequent , so maybe not far fetched for multi eared ones; there are afterall recorded instances of two headed snake, calves, goat, etc.
But your reactions are interesting in a C.S. Lewis fashion. With the prevalence of photo shop and snap chat filters, CGI movies, an entire generation has come to false images as ho-hum and not at all remarkable.
Current culture mores seem to indicate that demons and the ant-Christ could appear uncloaked in light and be thought of as “cool”.
Pyewacket, the feline familiar from the movie “Bell, Book, and Candle”, 1958, being a an evil Siamese was obviously a creature of the under world, why not this smoky cat.