Well, I think that to use the Dark army against Sauron to overthrow him and destroy the Ring would have been a deed worthy of Sauron himself. That is, Aragorn couldn't and did not want to use such soldiers, such ;wraiths of fear and darkness' that evoked a nameless fear, not only in his enemies, but in his allies as well. It would have been no telling the good side from the bad side then.
In addition, I don't think that the dead would have it this way. My understanding was that they were summoned only for a single battle, which makes it a truly hard for Aragorn to decide which battle this would be.
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And no one was ill, and everyone was pleased, except those who had to mow the grass.
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