Time for the tribes to assert their "sovereign" rights...
...and have the rapists "extradited" to the tribe.
Then you show them what happens to people who misuse their talleywhackers...
I hear hydrochloric acid works nicely.
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche