Let's say you are the King. No really, you are now the King. And your military starts executing people in your city because they don't meet the standars of "behaviour" that a very few "core" members of the nobility share. Anything that doesn't sit right with the "core", gets cut out as the difference in customs and beliefs will often be seen as problematic, if not offensive. Because only a few people will share the same perspective as the "core", your military will soon had killed a majority of the populace. Your city's activity might start looking something like this:
This will make the "core" very happy as they achieve the purity of "rite and faith" they always wanted but, on the other hand, your city might look more and more like a ghost town. Just food for thought.
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