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<< if it wanted it could still wipe out the U.S. We will never have a SDI system to prevent 30,000 nuclear warheads. >>
Ummm... Why not? Once you have a system that can effectively take out one warhead, you just multiply that over to take out several warheads. The cost of expansion will be minimal anyways, since most of the cost is going into research and development.
Of course, Bush isn't going to come out and say that we're building a system that may one day be able to thwart any nuclear attempt because that's too large a promise to make, but you have to read between the lines on this one. >>
Cost will be minimal? What are you talking about. First of all, each warhead will need to be shot down with a rocket. And these rockets will cost tens of millions of dollars each, if not hundreds. Also, if you don't shoot down a rocket at launch deep in heart of Russia, which is hard to do, they can just put 5 or more warheads on each launch vehicle. So once they separate in space, you need 5 rockets to shoot down the warheads launched from one rocket. Russia has agreed not to MIRV warheads, but if ABM treaty goes, all bets are off. I would expect them to MIRV their warheads, in order to keep parity with any defensive measures taken by US.
So if you want to stop a Russian full strike, you will need to spend hundrends of billions of dollars, to build it, and hundreds more to maintain. Even then, you still won't be 100% sure that the system will work to stop all incoming nukes. And even if only 10 out of 2000 thermonuclear warheads reaches it's target, can you still call it a success? I think it might be useful against Korea, and maybe China, but let's not get too carried away.