Here's a thought experiment to put fake-Indian mascots into perspective.

Imagine there is a newly built high school in Berlin, and in the manner of Americans they want to choose a mascot for the school.  They decide to choose "Jews" to be the mascot.  On game days people like to wear Yamulkes and fake peyos and long black jackets.  They have game chants that are supposed to sound vaguely like Hebrew or Yiddish.  Given the history of Germany is this appropriate or not?  Do you see parallels to American history?  Discuss!