The bikers have as much of a right to use the roads and local establishments as the natives have to go and pray on Bear Butte. Its not like the bikers are abusing or harrassing the natives they are simply hurting the natives with all their noise.
You say the issue is the USA's treatment of "modern Indians" yet early you posted about the USA having no right to the land and stealing it from the natives...hmmm...

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I am mostly European and I have a little bit of Cherokee and an even smaller ammount of Hopi in me. The slaughtering of native americans was done by a small group of people and you need to realize that all Americans are immigrants and many are recent immigrants in that last 100 years. We weren't all here in the beggining. We didn't all have slaves, and we didn't all participate in every single negative aspect of our culture that ever happened. America is made up of thousands of different cultures all brought together and that is why it is great.