The reason is simple: It will NEVER be subjected to a proper testing program.

What is a proper testing program? My answer to this question is:

1. Several Fleet Ballistic Missile Submarines fire dummy warheads at safe targets in the USA. (A safe target is an artillery or bombing range.) The total number of incoming warheads must be equal to the rated capacity of the Anti Ballistic Missile System.

2. NONE of the missiles will be intercepted on the first test. (That is the way first full-scale tests usually go.)

3. After six months, the revamped ABM System is subjected to the same test as in #1 above.

4. This time, the ABM System will probably intercept perhaps 10% to 20% of the incoming warheads.

5. Six months later, the re-revamped ABM System is tested again as before. This time perhaps 50% of the warheads will be intercepted.

6. And so on, and so on, until something like 90% of the incoming warheads are intercepted.

7. Full-scale testing continues at a reduced pace, say once per year or two. This is ongoing to make sure that the system's performance has not deteriorated.

This testing program will NEVER be implemented. The reason is that the Pentagon and the defense contractors will never agree to any such test which is certain to produce humiliating results. Since it will never be tested, it will never work above the 10% success range.