I presume he's complaining because they aren't useful NPC's... like peeps who turn them into level 1 and 2 npc's. I fortified my area too to stop peeps visiting, but I made darn sure that every npc I built was a 5 or 10. I also know of a now-departed leader who would purposely conquer land near his enemy and make npc1's and 2's to reduce their ability to farm.