ExploerTM
Ruin has found you at last!
- Location
- Russia, Perm
- Pronouns
- He/Him/His
They do explicitly state that species with Wish capabilities are rare in the Universe. And since they are emotionless automatons, uptake in terms of resources would cost basically nothing, manipulating people is free action basically. Hence why...They're thinking in infinite for the universe, not for earth.
They have other planets and don't need to sustain any single one indefinitely, because they can simply find new ones when one runs out.
That's why they are more than happy sacrificing earth, it's already on the schedule anyway.
...looks to me like the actual reason of not bothering with it. If they believe other species might threaten them somehow, letting them die or even wiping them out on purpose is much more believable motivation.