You actually raise a great point here. When the autopilot system in an aircraft fails, as was the case in Air France 447, government authorities step in. They g

You actually raise a great point here. When the autopilot system in an aircraft fails, as was the case in Air France 447, government authorities step in. They ground every aircraft with that equipment, conduct investigations, ask other countries to also look at the data to see if they come to the same conclusions, and ultimately hold the manufacture responsible for failing to meet airworthiness standards. Pilots are generally _not_ found at fault for equipment failures unless it is something part of the pre-flight checklist.