And the wall Israel has?
Not really, the wall isn't complete but complete it would be very effective, just as the Israelis wall is effective. If you have ever been to the Vatican you would know that its walls are very effectives as well. Why is it offensive, good fences make for good neighbours.
I've been to the Vatican, and lots of other places Bob. Why assume the worst about people?
Israel's wall is more or less complete. The US/Mex wall is far from it and I doubt it will ever be complete. It "leaks like a sieve", there have been numerous tunnels discovered, and is of much of a deterrent.
Israel's wall is illegal and they are willing to break the law and use rockets etc...to decimate apartment buildings defending it. I don't see much similarities to the proposed Dominican wall. The DR can barely keep the lights on and it takes forever to build roads that are soon unusable. A wall is not the answer. DIPLOMACY is.