Earlier quoted context omitted.
> but isn't that how Nature works? Nature has encountered countless extinctions before us (where's the Megalodon now?) and at least 5 mass extinctions, so why should this dynamic cease now? This mass extinction caused by humans is an order of magnitude faster and affects far more varity of species and plants.
Even if that were true (and I'd challenge the variety of species and plants, see [1]): what, objectively , is the problem with that? Furthermore, even if the pace and breadth of current extinction were that dramatic, isn't the argument against that a purely emotional one? I sincerely doubt that most humans can even name a hundred species; would they really miss a few million if a few million others remained? Just to…
If you extrapolate the speed of current devastation, extinction and let it play out over the time-span of the last mass-extinction, there really wont be anything living on earth besides micro-organisms.
Non-selfish arguments for why we should not kill off other species? Why should we not kill all life bigger than a pea on earth? Ill let you take that one.