I don’t get (any of) the arguments against mind-brain identity theories.
It’s usually argued that multiple realisability kills MBIT (see also this post). In a talk I attended it was stated as follows:
If pain = C-fiber activation, and extraterrestrials don’t have C-fibers, does it mean they can’t have pain?
Well, no. There seems to be another, less drastic way out. Is there any reason to assume that all pains are the same? Is there any reason why any pain is ever the same?
Pain is a category; just like every snowflake is unique, every pain could be unique, and uniquely and exactly corresponding to a certain physical (brain) state.
Am I missing the crux of the argument?