Easy to kill these humans
The military has weapons designed to destroy humans... anti-personnel bombs. They release a high-expansion gas, wait a few seconds, and then ignite the gas. All living things are incinerated (or crushed by the blast).
Rather than build that ridiculous wall, Israel could have used that weapon to wipe them out with one gas bomb.
- The military also has machine guns. As demonstrated in World War 1, a line protected by machine guns will create a "no man's land" where no human can survive, because they will be shot down by the rain of bullets.