At one point Smart argues that “states of consciousness” are physical because the opposite is “frankly unbelievable.” Why is this not a good argument? Can you think of things you yourself could prove...

At one point Smart argues that “states of consciousness” are physical because the opposite is “frankly unbelievable.” Why is this not a good argument? Can you think of things you yourself could prove because the opposite was “frankly unbelievable”?