Above all, it seems to me wrongheaded and dangerous to invoke historical assumptions about environmental practices of native peoples in order to justify treating them fairly. ... By invoking this assumption [i.e., that they were/are better environmental stewards than other peoples or parts of contemporary society] to justify fair treatment of native peoples, we imply that it would be OK to mistreat them if that assumption could be refuted. In fact, the case against mistreating them isn't based on any historical assumption about their environmental practices: it's based on a moral principle, namely, that it is morally wrong for one people to dispossess, subjugate or exterminate another people.
For many years I have regarded the Pentateuch simply as a record of a barbarous people, in which are found a great number of the ceremonies of savagery, many absurd and unjust laws, and thousands of ideas inconsistent with known and demonstrated facts. To me it seemed almost a crime to teach that this record was written by inspired men; that slavery, polygamy, wars of conquest and extermination were right, and that there was a time when men could win the approbation of infinite Intelligence, Justice, and Mercy, by violating maidens and by butchering babes.
Until we consider animal life to be worthy of the consideration and reverence we bestow upon old books and pictures and historic monuments, there will always be the animal refugee living a precarious life on the edge of extermination, dependent for existence on the charity of a few human beings.