You know I agree with you. The threat to security is awful enough by itself- then, you factor in the social disruption, and costs, it looks even worse. I say again, this is going to be an issue, whether or not the talking heads on TV or the politicians want it to be.
But when terrorists walk into the USA and leave their footprints going back to our unguarded border, I refuse to let them say "We had no idea! We thought there was already a fence there!"
Let the record be clear: our borders are wide open.