You take an elderly person who is confused or disoriented, put them in a bed with no side rails or a wheelchair with no lap buddy... and you're asking for disaster. If they're easily excitable, it just compounds the chances of injuries.
The reasoning? They have a "right" to fall. We live in an upside down world.
My dad, by the way, when he was falling, was not confused nor disoriented. He was just very stubborn and strong-willed.