it's not exactly arguable that the aircraft did the wrong thing
I still think it's arguable that the "right thing" is for the plane to say "Hey, I don't know how to fly this thing anymore, so I'm giving up! Oh and since I'm so confused, the plane is in alternate law, so all of those nomal-law protections you usually have aren't there." and then handing over control to the pilot that hasn't been actively flying the plane and expecting him to suddenly figure out what's been happening and why the autopilot gave up.
Since the pilots did pretty much the opposite of what they should have done, maybe the plane could have done better itself, even with the unreliable airspeed?
I still think it's arguable that the "right thing" is for the plane to say "Hey, I don't know how to fly this thing anymore, so I'm giving up! Oh and since I'm so confused, the plane is in alternate law, so all of those nomal-law protections you usually have aren't there." and then handing over control to the pilot that hasn't been actively flying the plane and expecting him to suddenly figure out what's been happening and why the autopilot gave up.
Since the pilots did pretty much the opposite of what they should have done, maybe the plane could have done better itself, even with the unreliable airspeed?