You're too stuck in thinking about sanctuaries and kills.

The supporting base are the villages where TB can move in, drink a tea and not get reported, but even be able to get some supplies and a bed for the night.
It's not something you deal with with drones and Hellfires.

The military reach is irrelevant. A whole infantry company can sweep that village and the next day the village wills till be part of the supportive base of TBs.
It's political.


And the support base is as much a legitimate target as it would have been legitimate if Germany had killed 30-80% of French civilians in '43 because of the Resistance.
No, they are not a legitimate target for deadly violence. The maximum justifiable violence would be a forced deportation.