I'm pretty sure the backlash has more to do with the feasibility of the wall versus other approaches to immigration reform. But sure, a wall would work great for keeping out the Mexicans if they were made of straw.
israel's wall sure worked! (and it's not even a full fledged wall, like the one Annoying Orange wishes to build)
http://www.jewishvirtuallibrary.org/jsource/Peace/fence.html0 Self Delete bombing-related deaths happened one of the fenced areas, as opposed to 19 for non-fenced
the number of attacks has dropped by 90%, when only 64% of the barrier was completed
palestinian terrorists have admitted that the fence deterred them from making attacks
293 israelis were killed and 1950 wounded by samaria-based terrorists before the barrier with 73 attacks.
after the barrier was completed, that number dropped to 3 attacks
but sure, walls dont work
edit: some more statistics from my favorite european country hungary
https://en.wikipedia.org/wiki/Hungarian_border_barrierthe wall isn't even around the whole country, only the south side near croatia

walls dont work!
no dude i agreed with your criticisms of islam. but I think it's pretty funny to see a group of christians calling another religion barbaric. I don't like any religions.
oh alright then
i just misread you i guess
i agree with you