Mitchell_Porter (as far as I can tell) still believes dualism needs to be true if colour exists (or whatever his argument was, I'm embarrasing myself by trying to simplify it when I had a poor understanding of what he was trying to say)

The argument is that for dualism not to be true, we need a new ontology of fundamental quantum monads that no-one else quite gets. :-) My Chalmers-like conclusion that the standard computational theory of mind implies dualism, is an argument against the standard theory.