The actual curse was that they would only have to fight in one battle to redeem themselves. SInce Aragorn wasn't the one to place the curse, it wasn't his right to change how they would need to be freed.
And even if they couldn't attack him, they could still refuse to fight.
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Re: Return of the King - Spoiler Version
I'm not too sure about it and I can't look it up now, but I'm almost sure that the army didn't have the super power they had in the movie. I mean, it's totally unrealistic!