So your argument is that we do so many terrible things already, that anything else is justified? Surely the better argument is that we should try to stop doing those other things.
Their is a hierarchy in nature whether humans are actively participating or not. Nature has no morality, it simply is. This is confirmed by animals that eat their young when they are too weak or starving. Perhaps humans have done and would do the same if faced with similarly dire circumstances but we would all like to think that it would take longer than it does for other animals.
and if someone doesn't do it, there will be people that will and due to the nature of AGI being extremely powerful (in theory) everyone else will just get enslaved by whoever enslaves the AGI first.
The outrage is unwarranted, however pleasant it might feel. In some way, it illustrates the problem: empathy is too bothersome.