I don't believe the two situations are at all equivalent. I'm moving, so I don't have time to respond fully, but I'll post my thoughts later. Short version: You can't walk away from a plane hijacking. People no longer are going to assume that any hijackers want a free ride and their buddies released from jail, the assumption is going to be "we're all going to die if these men succeed." The dogpile will happen, and has already happened on at least one occasion I know of.