Additional detail: The author was one of the architects for major pieces of the Iraq war, including the surge. https://en.wikipedia.org/wiki/Meghan_O%27Sullivan
To me the most relevant part was this: > She was an assistant to Paul Bremer in the Coalition Provisional Authority. She was Senior Director for Iraq at the United States National Security Council. Around that time, Bremer decided to bar former ba'ath officer from either serving the new military or getting pension. That decision almost single-handedly created the backbone of the terrorist networks that would become I…
This isn't true. The Ba'ath party had already largely lost its Arab nationalist identity and become progressively more and more Islamist after the first Gulf War.
Saddam announced the "return to faith" campaign[0] in 1993 (which he publicly hinted at by writing Allahuakbar on the Iraqi flag in 1991) and by the time of the second 2003 invasion, Ba'ath party loyalists were already beheading suspected prostitutes in the streets.
What created the backbone of ISIS is a culmination of things - mostly around the collective, ongoing punishment of the Middle East. Arab nationalism was challenged in every direction by the West, country-based nationalism was challenged in every direction, and then the US put on a surprised pikachu face when the only thing left was religious identity.