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The question isn't "why is Graner in Prison?" Its, "why is no one else in prison." Graner broke the law. You don't have to follow orders if they are illegal. If someone ordered you to jump off a bridge, would you do it? The idea that torture is somehow OK if your superior orders you to do it its completely ridiculous. I have no sympathy for this man. He did something inhuman and he should pay for it.
However, that doesn't mean that I also think he is the only person who should pay for it. There had to be others responsible, and they should also be punished.