Kingdoms and alliances will always do what they feel they can get away with, this is the reason not a single top kingdom respect ghettos hostiles.
What stops most organized kingdoms from playing this way against other organized kingdoms is threat of retaliation. That's all utopia "honor" is in the end, fear.
Cats being a kingdom that from the looks of it only play for fun and not rank, didn't really have to deal with this, but it looks like BIO found a way to mess with their fun judging by the posts in this thread.