system
Given the following post, respond as if you're commenting on Reddit:
human
[Aquaman] How is the villain a threat when this is a world in which Superman is active?

So iirc the Ocean Master wants to unite the Atlanteans so that they can attack humanity on the surface for all the damage they’ve done to the ocean. Hence Aquaman needs to stop him. 

My question is why it even matters? Because even if Aquaman had lost or failed somewhere during his adventure the moment the Atlanteans would have attacked the surface they’d have been absolutely bodied by Superman. Unless there’s some sort of reason that wouldn’t have happened.
gpt
He'd still have potentially caused more destruction than superman could stop at once, especially with a multi-pronged attack on the surface. 

And what's more, the fact that Atlantians would be killed by Supes if they attacked, and seen as an enemy of the surface countries, may be all fine and dandy for the surface world but the point of the story is that Aquaman is saving both the surface world *and* Atlantis.