Hippy Liberals have some strange ideas about a lot of things. Indians are also known for cannibalism. But you will never hear that from a hippy.
Native Americans are portrayed as being sort of proto-Hippies who were pot-smoking, leather wearing, sandal shod dudes, who rarely bathed and lived as one with nature.
History as born out by archeology portrays them as warrior tribes who were in a state of constant war with each other over women, resources, and slaves. And through need or ceremony they would occasionally eat each other.
Also, there is evidence that when they could, the Native Americans would drive herds of buffalo, deer, or elk, off a cliff, take whatever they could from the carnage below, and leave the rest. So, even that "the natives only took what the needed" meme is more myth than reality.
The reason they 'only took what they needed' is because they did not have automatic weapons or a means of transporting the kills afterward, if they killed too much. It had nothing to do with any idea of conservation, or being one with nature.
But, if you say any of this to a Liberal, they will call you a 'racist' and then storm off. This thought would be an invasion of their "safe space".
