The fence should be built where there is no river.
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A couple years back I flew from houston south over the rio grand and then over northern mexico on my way to hawaii.
Looking down from the airplane I could see millions of trail leading north all along the Rio Grande.
I’m sure everyone sees them. Its no great mystery what’s happening.
No doubt you could see trails as there is no pavement. May people line up by the river holding cups, begging.
I am not saying that some people don’t swim across. They do. But you have to admit that you don’t see the pictures of them swimming like you see them walking across in Arizona, hundreds at a time. Arizona is where the fence is needed.