I respectfully disagree, for a number of reasons.
1) The cold war taught us that the one-upmanship of weapons proliferation as a defence is a bad idea. (The more missile defense are built, the better the weapons become to counter that defense.)
2) The insane budget required for these systems could be used for {'homeless', 'healthcare', 'foreign aid', 'research',...}
3) Some long drawn-out & pointless argument about weather the US could sustain a war against China...