Wonkazoo reminds us of a critical point. If four conditions exist....
1 - An AoA sensor is wrong
2 - It is wrong nose-up
3 - The magnitude of the error is large enough to trigger a stall warning
4 - The AoA sensor happens to be the one driving MCAS on this segment
... then MCAS will be "armed" and it will kick in at flaps up.
Even now, we know of only three such events, two of them leading to fatal accidents. Unless there have been a lot more than three, there is no prima facie case to argue about pilot competence, and the root cause to be investigated is how MCAS was designed, tested and approved for service.