A very good point he raises that I have thought about for a long time is where the debris from intercepted missiles would fall. Hitting them before they reach the upper atmosphere is the best solution. If a warhead burns up in the upper atmosphere it is going to disperse plutonium over a large area.
An important deterrence aspect of an anti missile system is not letting the other guy know exactly how good or bad it really is. It adds uncertainty to the other guys calculations. Plus if the other guy know what it's strengths and weaknesses are it's easier for him to develop counter measures.
Didn't anyone in the Democratic party learn from Truman that wishful thinking with the Russians gets us burned.
The biggest flaw of Obama and his supporters is they don't understand that the basics of human interaction are not the same from one group of people to another. Unfortunately he and his supporters have had it drilled into them since kindergarten that if you are nice to people they will be nice to you too. There is a serious lack of understanding of the real world.
With certain groups of people ie gangsters, you can be too friendly.