What pre tribal humanity?Well, I'm speaking of pre tribal humanity.
But nor could they protect life on the level that we currently are. And environmental and biophilic ideas are only just starting to have an effect on human behavior. I think it likely that the biosphere is likely to be more well taken care of with human beings capable of understanding what it is actively protecting it than simply by removing our power to do much but also our understanding of what it is that needs to be protected, or that need at all.Even in tribal humanity, they couldn't erect the destruction on the level our industrial civilization currently is.
Extinction isn't my concern so much, that's natural to evolution. Destruction of the biosphere is the problem though.
Extinction isn't your concern?
You don't care about homo sapiens. Now it seems you don't care about any other specific species either. If no specific species has value, what value is there in the biosphere as a whole? Unlike you me and a chimpanzee, the biosphere isn't even conscious.
Yes, extinction is natural, but the rate of extinction is something that varies. And it increased a great deal during the spread of humanity over the globe.