Keith Parsons, other philosophers, and dualism

Vic Reppert has redated two posts on objections to dualism, objections which Keith Parsons defends. One thing that strikes me is that Parsons doesn't seem to be defending the arguments he implies he's defending: opponents of dualism have liked to claim for a long time that there's some way to rule out dualism in principle. Parsons seems to be making the more cautious claim that in lieu of a detailed account we should be skeptical.