All these airlines have jumped to the rapid conclucsion that the way to solve this is to put a member of cabin crew on the flight deck when the other pilot leaves. I take it then it follows that an assumption has been made that all cabin crew don't have any stress in their life and they would never carry out any action similar. So you're putting a random cabin crew member in a flight deck with a pilot strapped in his seat, and a crash axe within easy access. It's no different! It just another potential problem on the flight deck. It will solve nothing