Many books about Halloween have illustrations of kids dressed up as Indians, and due to society's embrace of things-Indian and playing Indian, most people don't give it a second thought.
What else do kids dress up as at Halloween? I don’t mean animals or superheroes, but people-costumes. They can be policemen, firefighters, cowboys, doctors, nurses, pilots, astronauts, baseball players, cheerleaders... All these are occupations or positions one can, in fact, be at some point, with the proper training.
Another question to consider: What sort of Indian are we encouraging children to be when we endorse an Indian costume, and what does it teach them? Are they savage Indians, the ones who, according to history books, were murderous, bloodthirsty killers? Or are they the tragic ones, heroic, last-stand, looking into the sunset, riding away despondent over loss?