Earlier quoted context omitted.
Interesting logic. The government is willing to go to war to obstruct Iran from obtaining nuclear weapons, yet not when North Korea is actually testing and threatening to "target" the U.S.: http://www.nytimes.com/2013/01/25/world/asia/north-korea-vow...
If Paris/London/Berlin were somehow within 30 miles of Iran's border, nobody would think about going to war with Iran so easily. If any major city of western allies was a few dozen miles from Iraq, nobody would've gone to war with Iraq. Yes, S Korea's not very lucky in the geography department. Actually the whole Korean peninsula.
The US had a brigade of soldiers stationed in West Berlin whose survival time was ~72 hours in the event of hostilities with the Soviets.
We almost went to war multiple times over things like geese flying over radars. Both the US and Soviets played little games like parking ballistic missiles in Turkey and Cuba to measure the reaction.
Iran has the ability to control the Straight of Hormuz. Iraq had the ability to harass shipping traffic in the Gulf. That waterway is far more important to the US (and Japan, and to a lesser extent, China) than Paris, London and Berlin.