If we pissed off anyone, it's Canada, there government hates ours because they dissapproved of the missile defence system, but we ignored them and went along anyways. I think they would be one of the countries who would want to prove it doesn't work to have a missile defence. Doubt it would be the government who actually sends a bomb, governments just don't do mass destruction weapons anymore.

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Would you rather be in a situation where you need a missle defense system and not have one (i.e. a bunch of nukes/missles are headed your way)? Or to be in a situation where you have a missle defense system, but not need it at the momment?
In your answer please consider the time it takes to set up and build an entire defense and such.