Not an anthropologist, so take my casual observations with a grain of salt, but I can think of quite a few examples of latter day stone-age societies that are n

Not an anthropologist, so take my casual observations with a grain of salt, but I can think of quite a few examples of latter day stone-age societies that are notably bloodthirsty. The few remaining indigenous tribes in the amazon, for one. 'Headhunters' in Indonesia, for another.