Amaranth, I've detected an opposit view point about this discussion and I can't clear the whole of your argument because they are realistic.
My view point was settled on the "life" as quantitative not qualitative. Yes, I guess human don't fancy low oxigen based life because of the less diversity and the sulfid smelling. But this is life after all.

The important point is to promote life in a place, whatever life it is. Never mind.