When is the last time that you read about an iron causing a house fire? Probably never...)
An hot iron may be left on standing on an ironing board in your home.... but a home doesn't move side to side and up and down, to initiate the iron falling over, with its hot surface landing on fabric or carpet.
It's much more possible on a moving ship...... so why anyone would want to additional safety hazarrds on a ship is beyond me.
Fires on cruise ships are very rare because of high safety standards and practices. But it's still one the most dreaded hazards at sea. There are no hydrants for the fire trucks to hook into. Oh wait, there are no fire trucks to call.