So if a wall works in a warzone then wont it work on a peaceful border?
1. The decrease in bombings
coincides with the building of the wall. Correlation does not imply causation, however.
2. Trying to (illegally) immigrate to a country is not the same thing as bombing it. They have different motivations and different methods - if you're looking to bomb a place, you're probably not going to worry about crossing a barrier quietly.
3. The smaller size of the wall makes it easier to monitor. Duh.
4. Most importantly, illegal immigration won't be stopped by a physical barrier no matter the size because
illegal immigration isn't caused by literal border-hopping:
I think you might be surprised at the number of illegal immigrants who didn't come to america by literally border-hopping but rather by legally coming into the country on a tourist visa and just never leaving
It's as easy as visiting a foreign country for tourism, and not making the return trip.