Most of what you said was happening with or without an Afghan invasion. Talking about Iraq, the extent which they were willing to sell the war, making up an imminent nuclear weapon threat, they were going in one way or another. Bin Laden/Taliban/Afghanistan just made it easier.getting back at the terrorists was absolutely not the main objective. Being seen getting back at the terrorist was of course politically necessary. But the psychological impact of the terrorist attack in NYC and DC was ultimately leverage to provid an extraordinary and unmissable opportunity for the neoconservatives to try and realize what had up to that time been a pie in the sky dream due to the continued momentum of internationalist outlook and multinational mutural security institution built during the cold war. That dream was to leverage the overwhelming military power that the US developed during the cold war to forcibly overthrow regimes considered to be obstacles to permanent american hegemony in Euroasia in the post cold war world. 9/11 was used to run roughshod over those tradition multinational mutural security institutions and pretend unilateralist american hegemony was the most internationalist thing of all.
Attainment of the dream to excert anerican military dominion across the middle east was actually if briefly within reach, if administration did not also fuck up so badly by being so greedy as to impose constraints on the effort designed to maximize the domestic political advantage for the republican party.
If anything, 9/11 rode roughshod over domestic rights. The collapse of the Soviet Union already sold the world on American hegemony disguised as protection of freedom, human rights and democracy. Again, no Afghan war or 9/11 necessary.
Basically I don't disagree with 90% of what you said, just to me Afghanistan was a side door that unlocked rather then the front door that had to be kicked in.