Annexing people who don't behave (partisan actions) is annoying because they will attack you the whole time, like the West ™ let it happened, without strong responses (killing off 100 males aged 16-60 in that area) or you have to use more historical measures, like killing the 10-100 for 1 dead/injured/attacked own in the area it happened.
So, if you don't have the guts to do what is nessecary, don't start annexing wildlings cause it will only cost and not end.
These people aren't bad in the meaning of "bad".
They are products of circumstances like every being in this world.
In THEIR view of the world, we are kuffar, lower than cattle. IMO they are wildlings who shall live in their cave, best would be to fence that area and let them live their litte life, if they starve/die/die out, doesn't matter, not have anyhting of value.
IF Afghanistan would be our neighbour and they start their annoying BS, I would pledge for securing (with most brutal measures) a 50km buffer zone.