I'd prefer not seeing that done in such a generalized way. If you are a Kingdom, why would you care if say a captured Empire city were razed? You'd probably celebrate and congratulate the other Kingdom honestly. If you are playing an Empire, why would you care if a Kingdom city were razed? You most likely wouldn't. What if you are a Kingdom and are at war with an Empire, and an ally Kingdom is also at wat with said Empire? Why would your ally respond negatively to that? Also, the people that make up the Empire believe they are "better" than men, so you would think that removing a city of men would be a good thing from their perspective.
In my opinion, you would have to take a lot of things into consideration here. Which faction created the city, what is the creator Kingdom/Empire's relationship with the Kingdom/Empire you want to apply the reaction to? What are the relationships with the K/E that razed the city?
If you want to do this well, then it's not really as cut and dry as people are making it sound.