I would say that since Jerusalem is one of the most troubled places in the world historically - that - 'walls work' -------- is complete and utter BS -
if they work - then, peace would have reigned here for centuries -- but,
it's anything but.
Walls create a barrier to friendship - fairly obvious unless you are a very frightened person
"The city of Jerusalem has been surrounded by walls for its defense since ancient times. In the Middle Bronze Age, a period also known in biblicalterms as the era of the Patriarchs, a city named Jebus was built on the southeastern hill of Jerusalem, relatively small (50,000 square meters) but well fortified. Remains of its walls are located above the Siloam Tunnel. "
