No, that's not been the discussion, especially in the supposed "teach 'em a lesson" rationale. It's always been about Islamic terrorists vs Christian or Jewish terrorist organizations. And that those countries with nukes, such as the U.S. and Israel, which are largely Christian & Jewish respectfully, that although we could practically eliminate a country like Iran, we wouldn't. While a country like Iran, a chief sponsor of terrorist activity across the globe, now having been given the green light by Obama to go full speed ahead in building their nuclear arsenal, would if they could, absolutely try to eliminate 1st Israel, and last U.S.
In other words, just because we dropped 2 atom bombs that brought an abrupt end to WWII, doesn't make any subsequent nuclear strike NOT a 1st strike. ANY ATTACK, without provocation is a 1st strike, which would include any nuclear attack