"It is intriguing that at Khirbat en-Nahas, our large Iron Age fort is dated to just this period, suggesting conflict as a central concern even at a remote copper-production site."
I suppose copperwas used somehow to help them fight - so it WOULD be a central concern.
It was only a few years ago as I recall that they actually uncovered a historical artifact that mentions a "King David" from around that time. "Before that - it was just a story".
Copper was used to make bronze, the primary metal for arms and armor. (Hence "Bronze Age".)
Piecing together archeology is like trying to put together a jigsaw puzzle, with 99% of the pieces lost or missing. Trying to make dogmatic assertions based on fragmentary evidence is a chancy business at best. You're as liable to end up with egg on your face as not.