Talking about the wall feels like talking about 9/11 truthers. I think everything has been said. Here's my final point... Would you take the following bet: You get to spend an arbitrary amount to build a wall. If I can scale the wall, you have to pay me the amount of money you spent on the wall. If I can't, I have to pay. Is that something you're comfortable with? Even if you trust your gut feeling more than data you get from the DEA... even in your fantasy scenario, a wall is horrendously cost ineffective.