"Honor trumps interest (or subsumes it)."
Honor doesn't exist as they define it. So-called honor based cultures are really talking about prestige, "rep", "props", "respect", or whatever other pathologically self-centered spin-doctored term is in use there.
Something that I think is related to this is all the recent research that links self-esteem to violence. These studies are finding that one of the strongest triggers of violent behaviour is when one's self-image is threatened--so by artificially boosting self-esteem, we are increasing the chances that its level is unsustainable, and therefore increase violence.
The idea of "honor" being based on prestige, "respect," "props," etc. is a similarly "weak self-esteem" setup, IMHO--where undeserved "honor" can be sustained only through violence.