I recognize there are and were many tribes, many of them allied to European settlers. I was speaking more to tribes like the Apache, who until recent times were considered rather ruthless. Some modern accounts would portray them as puppy dogs that never took a single hair off a settler (or other tribes for that matter).
I've read some accounts (and they may be true, which is why I'd like to read further) that say it was the whites who started scalping, and the Indians copied it.