Three broken legs vs how many who scaled the wall and weren’t hurt? Wow......that’s really effective.
Land that isn't included in the park is privately owned and water from the river is used for irrigation and livestock. You can't cut a landowner off from his only source of water.
No fence not under constant surveillance by an armed force willing to use deadly force will keep out someone determined to cross.
In a time of cuts, Texas doubled it's budget for border security.