They will continue to fear (and hate) that which they do not understand... and or 'can't overcome'.

When they realize that 'multi-boxing' doesn't exactly provide anybody with an 'unfair advantage', then they will shut up (as most corpses should). Multi-boxing is not 'unfair' as it is something that 'anyone' (and/or everyone) can/could do. It's available to all. They should not be angry at the person who killed them with their multi-boxed army, they should instead be mad at themselves for not bringing an army of their own to the fight.

...

The benefits and joys to multi-boxing are only as limited as the imagination of the user... and the numbers of the opposing faction that you find on the battlefield.