Until I started looping through to pull some of the narrative wires out, I refused to believe that their mission would fail. The universe was dropping hints that 1) no one seems to care if humans live or die and 2) maybe that makes it less likely for them to be destroyed. But then I remembered what humans are all about, and we don't need anyone's help to do that. Also, while playing I had the distinct impression that the last human will die in a zoo, either as keeper or exhibit. Thank you for clearing that up.