If every pilot had to be trained for every possible situation he could get into to be a qualified pilot he would be in his 40's to get his first job on his own. Pilots are usually people that learn the basics and understand the results of altitude, type of airplane and how thousands of situations can confront you.
A qualified pilot knows how to deal with never before encountered problems. We all did but some people here believe these FO's were not at fault because they were not taught high altitude full stalls in an airplane advertised as stall proof. Well they got into alternate law and couldn't deal with it because it did stall and they didn't know how to recover. Who is at fault for that? I don't blame AF or AB, I blame the pilots. If AF hired them knowing they were not able to handle a stall at all altitudes then maybe they get some blame too.
If these two were allowed to fly by themselves without the captain in the cockpit they should have been more qualified in my opinion.