Scape Scape:
We need missile defence about as much as we need asteroid defence. That is to say not at all for the cost/benefit ratio is makes the whole issue moot. It's 21st century snake oil for militarists, nothing more.
No doubt.
First it was battleships in the early 20th, then aircraft carriers, nukes, high tech fighters, etc. Every military is always searching for the next big thing, and the leading power of the day wastes massive sums on it to find out it doesn't work nearly as well as predicted.