Seems like we need to start investing a shit load of money into ICBM missile defense.

[Quixote1818]

Everytime something crazy happens and we weren't ready, we hear it was a failure of imagination.

Vinod Khosla once said: Not thinking it's possible is a failure of imagination.

As long as there is this potential threat to human kind, we need to be prepared to stop it in any way possible.

[ProudMNDemocrat]

1. Having lived in North Dakota for almost 2 years....

Much of the state is a storage shed for ICBM's. Minot and Grand Forks Air Force Bases have Bomber Wings. I spent nights at both of them.

[Gore1FL]

2. I think back on missile defense ideas of the past,

They were pipe dreams of Reagan and Dubya that pretty much cost a lot of money, required treaties to end, and generally pissed off our adversaries and allies, alike.

[RickHworth]

3. More than enough has been spent

Stationed at Malmstrom AFB, Montana, 1981 - 84, maintaining Minuteman 2 ICBMs, I can look back at that mindset, during the Cold War to realize how insane it was.
Your starting point is that there is no winning.