You can look at history. I am Italian, we had a lot of internal wars and lawlessness in the Middle Ages. Most Italian villages had defence walls. People usually

You can look at history. I am Italian, we had a lot of internal wars and lawlessness in the Middle Ages. Most Italian villages had defence walls. People usually did not live out in the farmland, they only went there during the day to work, then came back within walls in the evening. The current city/suburbs/farmland concept will stop working in the event of societal collapse.