Sovereign nations should be able to do whatever the hell they want in their own borders w/o the meddling of other nations. Sure, it may be an eventual problem for other nations, but any nation should realize that the retaliation they would incur should they use those weapons in this modern time would be swift and harsh, to say the least.
While I agree with you for the most part, ( Mutually Assured Destruction does a good job of maintaining peace IMO) a problem arises when one of these less than stable soverign nations turns over (whether intentionally or not) a nuke / other WMD to a group with no return address. That makes overwhelming retaliation a difficult task unless you don't mind indiscriminately throwing nukes around.
Expect it to take place in places where Candidate X carries 70-75% of the vote.
Those are the situations where it doesnt really matter though. Because of our goofy Electoral College system, it doesnt matter if canidate A wins state X by 1% or by 25% of the vote, all of state X's Electoral College votes go to canidate A. Remember, you're not actually voting for your president in the US, you're just giving a suggestion to the Electoral College.
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So which one of your coward ancestors emmigrated to the US? ;)