Let's get the hell out, barracade the entire area off, and let them kill each other. We tried that. It didn't work too well on 9/11, did it?
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That's because instead of barracading them in with each other we brought them over here. Got it yet?
While I also think that the President has done a lousy job of securing the borders, the type of barricade you seem to have in mind is not possible, unless you're talking about bombing them back to the stone age and erecting a permanent blockade and Iron Curtain to keep any tech out and the savages in, it won't work. And the latter is not possible for reasons that are obvious.
Bush is right that the terrorists are much more of a threat only with state-sponsorship and assistance, so we have to change the political situation for our own safety. Does that mean that Bagdhad will look like Philadelphia in 1776 anytime soon? No. It just requires that a modicum of representative government be established.