The thing you're forgetting here is that there is no practical way to seal our borders against the most dangerous well-financed terrorists. If you seal the land borders, they'll fly in by plane or helicopter. If you search ever plane entering the country, they'll come in by boat from Mexico, Canada, or the Bahamas. If you search every boat tying up at a dock or harbor, they'll go to a remote area and just beach the boat and leave it. By this point you've also tied up hundreds of thousands of police and soldiers who would have been much more effective on the offensive outside our borders. This is why our anti-terror strategy must and does rely on going on the offensive against known terrorist groups outside our borders.
Lets see, we have literally *millions* from God knows where pouring across our borders, unabated, creating epic fraud, coast to coast crime, corruption, choking off our social services, hospitals, jails, jobs. This will cause the inevitable, complete undermining of our elections, by 2014. This titanic lawlessness will eventually destroy our sovereignty, and our country, leading to complete chaos. This is ever bit as dangerous as *any* terrorist, my friend.
"This is why our anti-terror strategy must and does rely on going on the offensive against known terrorist groups outside our borders."
That's true, but I think we're missing a bet by not training and arming citizen militias. If every solid citizen had a .45 in a shoulder holster and an M-4 in the trunk, it would be a lot harder for terrorists to get something going.
Bullcrap. That's the logic which says, "Banks should not bother with doors, locks or vaults, because determined robbers could still blast their way in from the alley using dynamite."
The idea is to make it so hard to get in the "easy" ways, that terrorists have to try more complicated routes, where there is a greater chance to ferret them out via fingerprints, their fake documents etc.
Simply allowing millions of unknown foreigners to stroll into the USA during wartime is criminal negligence.