My Identity Is Not A Costume for You To Wear!
Because we'd vanquished them, we could stop tearing them down and start building them up. We could change them from "dirty redskins" into "noble savages." That way, we'd look great for defeating our impressive enemy. And they'd still exist in our memories, so we wouldn't have to think about all the massacres and corpses.
For more on this subject, see The Political Uses of Stereotyping.
Back to Halloween. Go to the original posting to see examples of pseudo-Indian costumes. Alas, there seems to be an endless supply of these stereotypical outfits.
For more on that subject, see Trick or Treating Indians.
Below: Liv Tyler as an Indian maiden. "It's okay. My 'Mexican' friend is as stereotypical as I am, so no one will notice."