They likely have little idea of what being governable means.
They’re an uncontacted tribe. All they know is some strange people showed up on their land and started wrecking the place.
If some people showed up at your house, wearing strange clothes and speaking a language you don’t understand, started tearing down your walls and throwing out your food, wouldn’t you resort to some kind of violence to defend yourself and your home?
This must be terrifying for them, especially because a lot of uncontacted tribes have oral histories about being forced out of their original lands by what we know to be mercenaries.