Don't forget scalping was taught to NA's by the Europeans.
Who broke almost every treaty between the US gov't and the sovereign NA Nations?
Who gave NA's "gifts" of blankets that happened to be laced with smallpox.
Bottom line, the Europeans were initially welcomed (for the most part) by the east coast NA's and it wasn't until later (and, too late) they recognized them as the invasion force they actually were and tried to initiate counteractions. Out west, the situation was a bit different as by then NA's were better armed (largely due to the French influence) and some tribes had adopted the horse culture and were therefore mobile to a greater extent. This made the suppression of NA's much more problematic with things basically culminating in Wounded Knee which was the army's revenge for the a$$ kicking they took at Little Bighorn.
BTW, not all Europeans were dirty dealers. The French philosophy of accepting different peoples for who they were and what they were lends itself to the fact their problems with NA's were minimal compared to the British mantra of conformist dogma and it's belligerent bent toward all that didn't bend a knee. Andrew Jackson and Mirabeau Lamar were among the (higher level) worst offenders of bad faith dealings although others of their ilk were legion in numbers. Bottom line, those who don't realize and accept their history are often doomed to repeat it.
So, if I were a Sasquatch, heck yes I'd take the covert lifestyle route...after what all I saw done to the First Americans by those thieving, lying, land grabbing, murdering sumbeatches.