That sounds extreme. It will make things too easy for big realms with big multiple armies to crush small realms.
Well, the numbers are mock numbers meant to illustrate a point. The severity of the situation could increase more gradually too, of course. But the point remains that the longer the situation persists, I think the increases in morale drops should get worse too. Even something like doubling the effect if you keep looting in four consecutive days without interruption.
LootEffect = MyRegion + Sum(MyDuchy) + Sum(MyRealm)
This would count the region itself 3 times and regions within the same duchy twice.
How about increasing the effect (moral drop= gradually over time if looting persists? Or do it slightly differently, that if looting persists and is not dealt with, loyalty begins to fall quicker and quicker, where sporadic lootings mainly hurt the morale alone. It's like the peasants first think "hey, this sucks!" and then "why there's nothing done about this?"
