Who is to say that having an FA in the cockpit will stop a mentally unstable pilot from doing something stupid? Although there are some intelligent FAs out there, I believe most of the younger girls/queens/boys wouldn't have the courage to stop an older/stronger male (or female) physically or verbally. Yes, someone like me would have at least an idea of how the autopilot can be disengaged but, unfortunately for you lot, I, or someone like me, am not on every flight.