"The US government cannot guarantee that no-one, anywhere in the world, will ever be able to deliver and set off a nuclear weapon in the US. Right now, someone with a nuclear bomb could quite easily come into one of our ports in one of our major cities on a yacht or fishing boat. Your 'missile defense' program could not prevent this, and anyone who was seriously intent on destruction would simply find a way to get around it (it's very easy to do). "

This statement I agree with. But, like the lock on your door, when a criminal can break a window and enter, I feel strongly that the anti-missiles are needed for those situations that they can prevent.