How the fuck do you know if it's offensive or not? If you are white and a non white calls you a whiteskin, you gonna get all bent out of shape about it? Please tell me how all of these not American Indians, can tell the actual Native Americans, that they should be offended. This is more than injustice, it's about these fraudulent politicians trying to make a buck and/or name for themselves.
It's rough when you try to participate in any sort of discussion without actually following the entire thing. One of the leading groups in protesting the name, and one of the groups that pioneered the movement, is the Oneida Nation. They are native. The Oneida nation were living here before any Europeans even had a thought about coming here. Hell, they had an early democracy before any Europeans thought of coming to North America.
The reason you want to reference fraudulent politicians (and others like to reference the white media as well) is because those are the visible people speaking for the natives who don't like it. Natives don't have positions in politics or the media to voice their opinions.
I believe that the American democracy is built on a similar base as the British where individuals are elected to government to speak on behalf of their constituents. When they speak for the native ones who don't like the name, whey are they fraudulent?
As for media, which I know you didn't mention, here's an interesting article.
Blackfeet Elder Says Rick Reilly Misquoted Him; Wants ?Redskins? Banned - ICTMN.com