I can't think of a culture that treated all plants and animals as sacred and apologized to them for killing them for food like in Avatar. That's a bullshit stereotype. Some indigenous American groups used to drive herds of buffalo off cliffs, harvest the meat they could carry and then leave the rest to rot. And that's just one of plenty of examples.

You have fallen for the myth of the noble savage. A racists mischaracterization of non-western human groups born from the very heart of slavery and colonialism that is used as a justification for dehumanizing others as wild or natural state humans, distinct and separate from civilized domesticated humans. It invites a tacit sanctioning of treating “primitives” or “savage” people as different and non-human, “not like us”. It's the basis of several centuries of abuse, oppression, appropriation and destruction.