You asked why not N. Korea. I answered.
I am not disputing your reasoning. Again my point is, if POTUS wants to protect American lives, do not invade a country like Saddm’s Iraq which did not threaten attacking United States of America, and did not even have the means to deliver his puny chemical WMD’s to US soil.
On the other hand N. Korea is headed by a crazy man who has openly said he will attack United States with nukes, unless we give in to his demands. And NK already has nukes and testing ICBM’s.