As for Iraq, the implicit gain was supposed to be access to Iraqi oil.
Setting aside the 12 years of “no fly zone” air combat operations above Iraq from 1991 to 2003, the U.S. has been at war for almost 17 years in Afghanistan and 15 years in Iraq. (If the word “war” is too upsetting, then substitute “continuing combat operations”.)
Since the burdens and costs of these combat operations are borne solely by the volunteers of the U.S. Armed Forces, the American populace pays little to no attention to the wars unless a household has a family member in uniform who is in theatre.
Permanent combat operations are now a barely audible background noise in America, something we’ve habituated to: the human costs are invisible to the vast majority of residents, and the financial costs are buried in the ever-expanding mountain of national debt. What’s another borrowed trillion dollars on top of the $21 trillion pile?
Read more at:15 Years of War: To Whose Benefit?