Yeah, that's the point I think,
@MarineHQ62 he has no own, grand ambition; he serves as a tool, always being under someone's orders.
Note that the expulsion or death of KAIDOU is portrayed of abnormal magnitude for the story to proceed, we have Oden screaming it, we have Roger, we have Whitebeard, we have Kaidou himself, the world government never tried to invade Wano because of Kaidou, the dawn of the world , the symbology that Oda used in Wano its importance for the story to proceed has been at abnormal levels, "open the borders for the coming of Joyboy", several references to Kaido and Luffy, Nika the sun god, formation of the most dangerous alliance pirate with the aim of conquering the greatest power in the world and ancient weapons and the One Piece, so Kaidou's fall in Wano is preventing several anomalies from occurring and taking a step closer to the true history of the world, this is not comparable to the simple fall of Akainu who has lower ambitions than Kaidou, Luffy's essence is to end the evil in the world, what evil is akainu bringing to the world? None , government is the main source of everything, akainu is just a tool.
Do you understand where I want to go?! Preventing something from progressing has been Luffy's essence of ending evil and bringing joy wherever he goes, I'm not seeing any harm in the navy, if he didn't have it in Wano people would be enslaved even more at the highest levels, the alliance of Kaido and Big Mom would progress and bring chaos to the world, not to mention the rest of the story that wouldn't go ahead as Kaido would still be strong, so taking down Kaido is preventing castratofic events in the world, but Akainu falling would be preventing what in the world ? Exactly nothing, if the real evil in the government's case remains the same, then akainu is just a tool in the grand scheme of things, it's not Luffy won't fight akainu to bring change the navy it's too funny, a pirate trying to change the navy , this needs to be done by a sailor and Aokiji's role can be set.