Good fences make good neighbors?

Here is an approximate transcription of a conversation I had yesterday:

Lady: "You're a missionary in Israel? Wow. I've been there."
Me: "Did you enjoy your trip there?"
Lady: "Oh my yes. In fact, our tour guide took us to that big wall they're building around the West Bank. I could just imagine it finished and full of soldiers standin' up on top. That's what they need to keep those people [Palestinians] out."
Me: "Hmm. Well."
Lady: "That's just what we need on our borders. I hope that our country learns something from Israel, build us a big wall down there [Mexico]."
Me: (small chuckle) "I just heard though that they clocked someone, and it only took three minutes to climb over. I'm not convinced that's the best method to secure the border."
Lady: "It'll take a lot more than three minutes if there's a soldier on top with a big 'ol gun."
Me: "Um. . . . Yes, I suppose so."