if you destroy a kingdom, the surviving clans will be enemies (and they are everywhere)
and somehow they count as enemy kingdom i guess
And now my vasalls ♥♥♥♥ their pants cause i have so many enemies (even though they are no danger)
And always want peace with the kingdom im at war with currently (even though they get anihilated)..............................
Thats just annoying but i guess its a problem of the main game mechanics