I agree that there should be a kiddy pool or at least a splash fountain type area for the kids, they pay to cruise too!
Many will cite the "hygiene" aspect of kiddy pools , well then set up a splash fountain , kids get hot too!!!!!
Cruising with a family is not cheap , so yes if the cruise line promotes themselves as being family friendly then they should put up the facilities needed for kids, otherwise people will let their kids" break the rules" and use the adult facilities. At a thousand bucks a kid( airfare included) kids count as paying customers!!!