You shouldn't be surprised, however, if your ancestors wiped out a previous people (or that they wiped out the mega-fauna in the Americas) any more than you sould be surprised that your crap stinks as much as everyone else's does (that has the same diet, anyway). Humans are humans and have been murdering each other for as long as they've existed.
I've been recommending it a lot in the past few days but I strongly recommend reading Lawrence Keeley's War Before Civilization. And realize that "the peaceful savage" is both a myth and quite patronizing, as well. As I explained to another Native American here on Free Republic, hiding the remains will stop scientific understanding and progress. To that, I'll add, the vacuum will be filled with myth. The best way to fight the white supremacist myths about Kennewick Man woudl be to show he wasn't European, I would think. To leave it undefined is to leave it open to conspiracy theories which will, most likely, be worse than any truth.
Very well said.
CHEERS!