I've read (in a source I no longer remember) that the Mongol tribes of the Steppe, like some other cultures, had this habit of raiding each other without it being seen as an act of war. More specifically, that despite those jerks coming and raiding you last winter, you're still willing to trade with them later.
Is this accurate? And if so, how does this work culturally and practically? It's difficult to understand a system where people just accept it as a part of life to raid each other from time to time.