Catapults alone are good enough technology to prove why the wall is an idiotic idea. The wall is an effigy anyway for Trump, while he may actually believe that

Catapults alone are good enough technology to prove why the wall is an idiotic idea. The wall is an effigy anyway for Trump, while he may actually believe that it's a good idea, that's not how it functions in reality. It's an anchor, a symbol, a thing to point to that combats illegal immigration and is a symbol of nationalism. Now Trump might actually think it's a good idea - and I actually think he does - so that's absurd. But realistically it operates as a political beacon, and one that's quite effective.