T D, it's not as simple as you suggest; biased by hindsight? (#279)
We cannot assume that pilots will understand the situation as requiring a cross check.
The PF may be concentrating on what appears to be a sudden pitch upset manoeuvre, the PM surprised by the PF nose-down response, where the situation according to PM apparently requires a nose up manoeuvre, and not necessarily seeing the comparator alert.
The pilots cannot deduce that 'the right side is good' without comparing both EFIS with the stand-by ADI and then confirming which two displays agree; this takes time and mental effort, neither of which may be immediately available.
Trained for confusion, or confused by training. There is a level of confusion where the human cannot manage.