Well, if the probability of a system error is significantly lower than the probability of a pilot error, isn't that still a good thing? What's worse, 10 planes crashing because of a pilot error or 1 plane crashing because of a system error? Not to mention that it is actually possible to fix the system error after the first accident so that it never happens again (although a different error can still happen), but you can't 100% "fix" all the pilots, even though you can give them better training. And as I understand, there are already similar systems. For example, I remember NGE's Mayday episode Pilot vs Plane, where the pilot pulled up and the nose went down because of the Alpha Protection or something, in order to prevent stalling. The plane still crashed anyway, but it was determined that the crash would be worse if the plane obeyed the pilot's command and crashed after stalling.