Many citizens of Berlin (the one in Wisconsin, but not to be confused with New Berlin) are upset that they are being forced to give up their traditional Indians team name. They are convinced that there is nothing offensive about a bunch of white kids pretending to be Native Americans; indeed, it is a tribute, to their way of thinking.
I wonder if they (or Rep. Steve Nass) thought the Galesville-Ettrick-Trempealeau Redmen were a tribute to Wisconsin's first residents. Or that 19th century minstrel shows were a tribute to African American music and dance traditions.
For the record, I believe that the name Fighting Irish is also deeply offensive, and the NCAA should force Notre Dame to get rid of it just as they forced schools to drop other race-based team names. I also think think the NFL should follow suit and retire the names Redskins and Chiefs.
On the other hand, Vikings are not an ethnic group but rather an occupation, like Pirates (or Buccaneers).