Yamato isn't doing shit.
Loki has expansionist goals of his own.
Momo is only keeping the borders closed because his Dad said so.
Carrot isn't defending Zou from anybody.
And all these countries were, likely, at one point part of the first and biggest empire in the OP history, the AK.
Yamato talked with Luffy to stay and train Momo and defend Wano against the eorld governement for some time
Loki is against the knights and may have been framed and want to do good for Elbaf, and I don't remember sorry, what expansionist goals does he have?
Carrot is one of the strongest minks so if the world governement knew qhere Zunesha is she would be one of the main defenders, which Imu would probably want to attack Zunesha if they knew where she was
And Joyboy was the first pirate, doesn't that imply that the ancient kingdom was an anarchist land?
Since that may mean there were no pirates in it