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Because jerk face the wall between the US and Mexico is about 90% un inhabited. The Gaza is densely populated. A lot of structures to hide tunnel efforts.

The wall separating Israel and the West Bank is a better example.

Ahh, then again, that cuts both ways asswipe. If there's no-one living there than either (a) you're going to have to build enough towers, and man them with lookouts, to cover the entire 1,969 mile length of the border, or (b) have the smugglers simply spot where your watchers are, figure out what the limits on their visibility is, and then tunnel outside that range.

Besides which, the US does not control Mexican territory and cannot enter Mexican territory willy-nilly to stop smugglers who've started digging a tunnel - a fact that you are apparently unaware of - and therefore even if we grant your psychotic belief that smugglers won't be able to hide where their tunnelling activities start, there is no way that the end point of those activities could be prophesied, short of spending trillions on putting soldiers or police shoulder-to-shoulder along the entire 1,969 mile border and at least a half mile deep back from the border.

You are an insane, raving lunatic if you think smugglers won't be able to make a mockery of whatever wall gets built.