MArauders are there own faction and clearly are ennemis of all other civ and power but i won't start the mara's troll here mara are ennemis of the kingdom so it's logical that the kingdom don't want them.
MArauder's Lore
Who are our enemies?
Homin governments: the Powers encouraged homins to devise separate governments only to divide hominkind. The only true civilization of Atys is that of the Marauders!