I seem to encounter many litreture ( where mostly Advanced AI's or Alie'sn decide) that Humanity must be annihilated in order to save Earth.
Even though Earth is really unique (with radiative cluster, giant moon, appropriate distance from right class star etc.) to let evolution and there may not be a second one (?) among 'Earth like' planets, I can't help to think that an intelligent life form such as Humans should not be more common than Earth.
And since many choose to kill Humanity rather than Earth in their work my question is: Is really Humanity more expendable then Earth scientifically or is it just to create a melodrama of justified punishment of our greedy nature and discovering/showing ourselves that we are more than that?
PS: Not sure if this question is more fit here than a science based network.