Well I don't know if people are sincerely moral? As someone who doesn't believe that true altruism exist, I just believe that people have ulterior motives when having moral crusades such as reducing the rate of extinction, banning the novel use of wild animals, etc.. These motives could vary from a a receiving a scratch back after scratching many backs (no matter how late that scratch is returned), to being honored/ getting positive attention for being a savior, or gaining power to eliminate people and lifestyles they consider to be cruel and evil. Maybe the term I am looking for is moral convenience. That good feeling of saving the earth or its biodiversity won't be worth it because everything has an end, including our lives. Even if we destroy humanity to restore nature (which I wouldn't be surprised if that was the last resort) to feel good about it, it won't be worth it for what has been built will be destroyed sooner or later be it with a bang or a whimper.