Wife is to blame.....
Taking someone who could have a potential psychotic episode, and strapping a backpack to his front (suspicious in itself) on a plane flight is not very smart. Either that or she is angling for a lawsuit and insurance money.
The air marshalls acted accordingly. They are trained to deal with these situations, they gave the potential suspect a chance to surrender. He instead reached into his backpack. Not a good idea.
The time for practical jokes in airports and planes is over.