This is a caricature and a straw-man. How 'peaceful' or otherwise pre-industrial peoples were is something nobody seems to agree on, certainly not 'the left'. Personally I just generally assume the past was crap - all of it, including all the bits conservatives view with rose-tinted specs, meaning they want to make a fetish of thanksgiving. The present is a bit rubbish as well. And things are probably only going to get worse in the near future.It's not a "both sides" it's "the full story" Dr. Toolbag.
Everyone in the politically correct left these days (going all the way up to fucktards that say we should get rid of Thanksgiving) have been acting like these Indian tribes were at all peaceful in anyway... Just playing banjos, drums, and humming tunes while doing cultural dances. They definitely weren't committing war crimes of their own - killing husbands of rivals, killing the children and making the women into sex slaves... No no never!
It wasn't the case at all. Up until the very end (that you guys love to grasp as if it encompassed all of the conflicts) the colonists were dying AND losing at that. Back in the days "dur hur we have a musket that can fire 1 round every 20 seconds" you had on the other-side bows/arrows that could fire by the second.