Arafat's Exclusion

Ariel Sharon is pushing the US not to invite Arafat to any American-led negotiations, and (apart from the fact that Sharon is of course a neo-Nazi fascist right-wing communist Stalinist pawn) who can blame him? My personal stance is that, operating within the guidelines of established US policy, this isn't a particularly tough question. We don't negotiate with terrorists - and the proof implicating Arafat as one is pretty overwhelming.