Tenshinai wrote:Selfdelusion isn´t very pretty, no matter how much you dress it up and put lipstick on it.
Actually, in that situation, weapons would be almost required.
Look at Terry Pratchett's Assassin School. Everyone went around armed and the result was that everyone was polite, since they all knew hundreds of ways to kill people and didn't want to provoke someone into using a way they hadn't studied to inhume them.
Think of it as the ultimate in Darwin's Evolution Theory. Anyone insane enough to believe they can take on dozens of armed people at once simply will not be around to reproduce, therefore their arrogance won't get passed onto the next generation.
After several dozen generations (and kids being raised on Grandpa's "when I was young, Mad Ol Frankie finally snapped 'cause all da girls didna like da way he neva bathed an started shootin', so we had ta put a bullet tween 'is eyes" stories), the local culture would have either settled on extreme politeness or be wiped out.
...or they could have turned themselves into the Legions of Moros...