The whole point of Algalon was that the curse gives free will, which allows our characters to save the world by acting in unexpected ways.
The reason there's very few Horde factions (beyond writer laziness) is that goes against the whole idea of a horde, which is a type of collective. Hmmm...
"We are the Horde. Life as you knew it is over. We will add your resources and peoples to ours. Resistance will result in genocide."
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Yes, how could I possibly miss your objectivity with your avatar and Doom Garrosh signature.
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If anything, pointing out that Orcs are titanforged, i.e. created specifically to order Draenor, strengthens the argument that they're alien to Azeroth.
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But that point wouldn't let them try desperately to prove the Alliance is just as blood-soaked as the Horde. That's the problem, the writers have to blow Alliance misdeeds way out of proportion to try to balance the scales, and Hordies have picked up on that. The funniest part is that when Alliance does something wrong, it's the Horde players that shriek the loudest that "Alliance isn't supposed to do that!", then go back to sneering that goody two-shoes are boring.