This is more of an opinion based paper, isn't it? in my opinion, they degrade the native americans traditions and they should not be used as mascots. some negative consequences are that people might not value the native americans as much and they may see the natives as something that is to be used for aesthetic purposes ; they may see the natives as an accesory. one may argue that they "honor" native americans, but sometimes the mascots are used incorrectly hence why they do not honor the natives.
