I think Ferrari could not afford Schu anymore and he was not willing to take a pay cut. I also think he was hurt by the reaction to the Monaco qualifying incident. It seemed like an opportunity to knock him. I doubt that any other driver would have been so openly condemned. Most drivers would have been given the benefit of doubt. Ever since the incidents with Hill and JV everything he did appeared to be tainted to a lot of fans. Compare that to Senna who in my opinion acted in a more calculated and pre meditated way. For some reason Senna got a pass and Schu was vilified.