That implies we fear a fight, we just begrudge the necessity of it when it's wars we don't choose to fight.
Setting up new realms means we won't have to fight, or have a war forced on us so long as they stand in the way as a neutral zone. It allows us to maintain our isolation.
You erroneously believe that a new realm in Paisly could somehow do something to prevent northern realms from sailing to your lands.
There's nothing that anyone in Paisly can do to prevent northern troops from sailing south, and sailing would be the most logical path for any non-moot realm to attack you. There's no such thing as a neutral zone. A buffer state between yourselves and Terran, sure, but no more.
