Try it while being shot at.
Whoops....you forgot about the surveillance.
Or even while a vehicle full of burly border guards with handcuffs are speeding toward your climbing position. . .
Plus the window of opportunity on the southern border when the temperature of the metal preventing a climb of the wall would be limited. As I said above, either way too hot or too cold to touch.
I have enough problem with the southern exposure of my front door latch and handle after a few minutes in full sun. We need a hot pad to avoid second or third degree burns while trying to open the door!
We finally bought a Velcro refrigerator door handle cozy (who knew there were such things. . . or people who need refrigerator door handle cozies?) to wrap around the handle to avoid the problem, and I made a matching thumb wrap for the thumb lever. Now we can actually grip the door handle long enough to open the door and not risk an ER visit, LOL.
Think about the temperature of the steel of that border wall after being sun baked with no shade. . . and it would hold it for quite a while. In winter, it would be a heat sink, pulling heat from human fingers. Cold fingers can’t grip.
the magic word kids here is “replica”..