You really don't understand do you.
The predators I am talking about can jump over 12 feet in the air. A wood fence would be easy for them to climb.
Fire and large groups of people are what keep them out of the village.
The same with the criminals. How many men would you put on guard to keep the cows safe? They are not allowed guns so they would have to stand guard with sticks. And since they will still have their day job to do how long can they go without sleep?
People do the best they can with what they have.
Do you think the Africans are really the only human beings in history that have encountered difficult obstacles?
First American settlers put up frontier forts within weeks of arriving in the new land.
The Great Wall of China is about 4000 feet long and is from 15 to 30 feet high.
And your reason why they can’t stand guard is because they might miss out on some sleep? Give me a break!