English

That is true for all wandering groups, and I'm amazed you hadn't met with it before. It must have been your luck.

I have a theory on the matter, however. The scouting / patroling groups of the tribes are looking for potential threats to the tribe and also checking for resources. A long time ago, after many years of bloody warfare and loss of their young homins in battle, the chiefs of all the tribes ordered their patrols not to attack or defend any other homins, but to keep watch and report back.

Since this agreement has proven beneficial to *all* tribes, it has continued to this day. You will sometimes see two groups of patrollers from tribes of opposite alignment sitting and resting near each other in a particularly nice location.

Should an enemy or perceived enemy invade their camp, however, all tribes will violently attack said enemy. Similarly, if a friend in need enters, they will defend. How they tell who is enemy and who is friend, that is a mystery.

My theory
Not a Lore maven.