The horizon indicator alone should serve as a check. If you (the computer) think the plane is about to stall, it makes sense to nose it down to compensate. Ok,

The horizon indicator alone should serve as a check. If you (the computer) think the plane is about to stall, it makes sense to nose it down to compensate. Ok, cool. But if you think it's stalling, and you see that you're at a negative attitude, then it's much more likely that trimming the horizontal stab is a bad idea. I'm sure there are other checks as well. Also not sure if I'm missing something with this armchair analysis.