Smart people walk across the Yalu river into China when it freezes over, but maybe it is difficult to get up there if you are in the south of North Korea.

Walls are stupid. The DMZ in Korea doesn't have a wall. They use mines and guards who shoot on sight. And even then, people still can boat, fly or swim across.

it's also cool to pay that much in taxes to build and maintain a massive concrete wall!
A system of barriers, sensors, cameras and radar makes sense. Not a wall.

Something like the Great Wall of China
(which I saw earlier this year)
would be cool.
My personal favorite prototype was this one:
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MAGA! FAFO! Schrodinger's Cat walks into a bar, and doesn't. Dumbocraps: evil people who celebrate murder.

Yes, an incredibly long concrete and rebar wall is deeply stupid and unnecessary, but that's what Don Sr wants.
We don't deny him hot dogs as a meal every second day, either.