A comet could wipe out all humans as well, but we don’t use that as an excuse to start wiping out other humans do we? Then why don’t those rules apply to the rest of the life we share this planet with?
Same here, if life has any chance at all to survive long term, that chance is through humans.
Sadly we are not all powerful and some species will go extinct before being restored, but if humans are "removed" these species living a few more years on a doomed planet is not any better.
Moreover, saying that ultimate goal of nature conservation is removal of humans is simply counterproductive, it makes people ignore the nature conservation efforts as suicidal mental illness, while we are mindlessly wasting priceless library of useful genes and proteins that took billion years to develop.