Could we stop going back and forth about who said what and who speaks English well and who doesn't and actually discuss this?
That's sort of what I was trying to do originally...since my two little jesters seem to have run out of things to say for the time being I'll mention that my reply to the poll question is yes, given how reliant we are on many species. However, since the eradication of species and the evolution of new ones is a natural course of events I don't really consider it the government's duty to protect species that have played out their role in nature. Most species wipe out other species as they emerge and there is no reason to expect humanity to be different in this aspect. I don't see any moral obligation to try and maintain some artificial nature that would have existed if we had not been around.
You bring up a good point - true animals go extinct on my own - and if we see a species going out and we can't figure out why/figure out it's not due to us, I say leave it alone. But I'm willing to bet that at least 90% of currently endangered species aren't due to this reason (I won't say 90% of extinct species, since this # is obviously less - we didn't lead to the extinction of dinosaurs, saber tooth tigers, mastadons, etc...).
FTR, pre-historical humans hunted mastadons to extinction, so we did have something directly to do with their extinction. Of course, since we were still hunter-gatherers, it can still be considered a "natural" extinction (in the sense that humans were acting on instincts and no more damagingly than any other newly evolved predator species might).