I think the game design is somewhat wrong at the moment or people's mindset is.
It is not that hard to destroy another realm when you have overwhelming strength. This wasn't really the case for the real world. Unlike BM where you can just turn regions rogue and let the game mechanic cause a mass genocide, it was a lot harder to actually destroy a country entirely. It takes a long time to stabilize your newly conquered regions due many factors involved in the integration process.
People need to either learn to stop wars after taking a region or two or there should be a game mechanic which will enforce it.
