The laser defense adds one more variable to the equation, do I or do I not launch missiles towards the United States.
The balance of power has just shifted ever so slightly once again in favor of the US.
If it remains as a program and is fielded, and right now, The Messiah cancelled the program (with Gates’ approval).
We simply can’t go around protecting the USA from nukes, now can we.
And if someone does launch a naughty missile, it's comforting to me that we can shoot missiles out of the sky. Win/win.