i thought this too, very believable, in fact it's another reason the movie sucked
he was a perfectly reasonable leader who mostly just wanted to stop the surface from literally and metaphorically shitting on their home
yet still at one point the advisor was like "aquaman has already shown himself to be twice the leader you are"
like
https://i.imgur.com/ED7r1tZ.gifliterally all aquaman had done at that point is talk shit and lose a fight
absolute garbage and I pretty much never say this about superhero movies
So wiping out the human race including yourself is ok for you.
Hmm ok buddy.