You bet I am, and if a virtual fence works so damn well, why don't we throw one up around the WH, and tell security to turn off the lights when they leave. Any future attack connected to the issue of "open border" policy by this administration is clearly on this President's shoulders, and those such as yourself who see no problem with the gaping security breach on both our southern and northern borders.
I'm not sure where you are posting from, but I am across the street from Ground Zero. NY remains the #1 American target for al Qaeda. So, yeah, I do have a dog in this fight. There is a 100% chance that there will be another attack in southern Manhattan at some point in the not too distant future. Again, if they want into this country, they have no reason to sneak in. They can enter legally. And there is little we can do to prevent this, short of closing our airports to all arab men.
I used to live in southern Arizona. I sympathize with the illegal immigration problems down there. But be honest about your reasons. Closing our southern border will have zero effect on national security, because that is not how the terrorists enter this country. Perhaps Mexicans are taking your jobs, or dilluting your culture, but they are not flying airplanes into buildings. Period.