Well the obvious response is then "can I conquer your land by force too?". No. Because there is a construction of "lawful property rights" that starts with the appropriation of land by force but protects the new owner from the same.

Well technically the land can still be appropriated by force, only you have to apply it against the entire system which enforces "lawful property rights"

The most human thing ASI could do would be to have its own Manifest Destiny

or just use the system which enforces "lawful property rights"

see: Adverse Possession

I mean murder's not a new idea either but it's broadly condemned in most moral vibes

"Right by conquest" is sort of a cope, like "You might have a green light and the right of way, but Isaac Newton always favors the semi truck"