I too have a low cheerfulness and high rudeness. I attribute the rudness to the fact that the way of straight-talking that is typical for Germans is seen as rude by Anglosaxons (the English especially, who rather try to hide problems and disdain by polite talking "behind the bush"). My rudness seems to rise whenever I answer social issues in a liberal, open fashion. Oh, and Imperial Leonist citizens are also very cool and relaxed talking about sex and other private issues, which the game also seems to subsume under "Rudeness".