We can take a larger view: competition is usually good and helps balance environments. There doesn't need to be a bloodbath, only a reasonable threat that requ

We can take a larger view: competition is usually good and helps balance environments. There doesn't need to be a bloodbath, only a reasonable threat that requires humans to behave in a way they wouldn't otherwise (another comment points out that greed is an awfully powerful motive, I'd argue fear would be a good control mechanism). Earth becoming inhabitable doesn't seem to do it. God figures won't do it. Godzilla won't do it. Hope we lend on something that doesn't need human sacrifices first.