Have you so little curiosity? There seem to be a couple of issues worth debating. Was Mozart, as he said, actually poisoned? What was Salieri’s main concern, guilt over feeling he had contributed (directly or indirectly) to Mozart’s early demise, or concern that the rumours were flying all around Vienna that he was responsible — even to the point of Beethoven’s putting in his two cents worth? How did these rumours (if they were that) contribute to Salieri’s breakdown?