The world certainly seems to have too many tiny countries ruled by scumbag nobles with hereditary succession. There's little to do to make the masses feel better without removing such a huge burden. Sion's first priority isn't to remove wars but to allow the people to live happy lives - though removing wars is naturally completely necessary for that goal.

We have yet to see the subtle differences between Sion and Gastark's king's approaches. Fortunately for the believability of the story neither seems naive and thus both employ shady methods and questionable servants to further their goals as fast as possible.