I believe that not setting an expectation makes that problem worse.
So long as multiboxing remains in the grey area of their product allowances people will show up on forums and complain about it. Soon as it becomes protected and recognized as legitimate way to play their MMO the complaints will cease for the most part.
The reason is I think the whiny tits do have a bone to pick here. Not an absolute one mind. Two characters are hardly an advantage anywhere in the world but 40 characters dropping on a quest zone and wiping out anyone that comes close is quite unfair. It's also not fair to a 15 man raid to have 2/3rds their raid a multiboxer who most likely won't contribute to their win.
There needs to be contrast for us. So that we can one be protected against whiny tits and two, not be lumped in with someone who is really out to destroy the integrity of the game.
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