Hmmm - apparently you didn't notice that missile defense systems are now working well in operational situations.  I grant that the one in Alaska had teething problems during startup and that it is extremely limited in numbers of interceptors.  Even so, the time has come to stop pretending the negative proposition "missile defense cannot work" is true.  [A negative proposition can never be proven;  a single success negates the proposition.  And we now have successes in operational situations.]  Not that a zealot is ever persuaded by mere facts.