...they had the technological and industrial capability to build a world-covering superstructure even while the planet was becoming uninhabitable (and terraform the Moon, sort of), as well as create reality-warping(?) powers, but couldn't be bothered to:
- occupy Mars (maybe cockroaches? exclusive property of Musk-chan?)
- build self-sustaining artificial habitats (because in space no one will hear you scream?)
- create livable zones on/under/above the surface of the Earth (angry Godzilla?)
Perhaps a small step for the mangaka, but far too many giant leaps for the rest of mankind.