Ahh big boss ninja looters then. There in every MMORPG and the only one which seems to be addressing such problems is DDO with it's chests looting system.
As far as that char never being played again, they normally aren't, they are normally sold on e-bay, a new account brought and there being zero long term repercussions for the player or a way of stopping it happening in the future
Since stopping playing WoW I've ninja'd some cold meat from the fridge and some peri-peri chicken marinade from the cupboard, which made a nice starter and main course. No dragons in the fridge or I would ninja that as well !!!!