Well that wording then let's the individual captain's determine what they will allow on board. They can interpret what "poses a hazard" s they wish.
I can understand their concern here as some people many have electrical items that are well used and could indeed represent a fire hazard. Better that they deal with it this way and enable questionable things to be confiscated than risk a fire.
Seems like a hassle to bring a fan with you but I guess some people who live near the port would do it...
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007