Oh, I don't believe he's lying at all, I believe he genuinely believes the white supremacist, colonialist ideology he was espousing.
One must go to fundamentals. What fundamental right does the United States have to militarily occupy a foreign nation for 20 years? It is surely not the "Democracy" imperative that the United States political and military elite have invoked with such temerity, as the majority of both US and Afghani citizens desire the US military to withdraw from this occupation. It is surely not the human rights imperative that is often invoked, as there are human rights atrocities taking place in many other nations, including the United States, that doesn't seem to provoke the same invasion impulse and post-hoc rationalization, and there are atrocities taking place under American colonial stewardship that go unaddressed because doing so would be politically disadvantageous to the American politco-economic system. It is surely not a practical imperative as the US has spent 20 years trying to impose its will and build an Americanized colony out of Afghanistan and hasn't succeeded. One can only be left with the idea that the United States feels it doesn't actually need to justify its colonialist ambitions over darker nations, they are accepted as default. It's a concept deeply embedded in this nation's psyche. The idea that the United States, as a unilateral entity, has no business being at the table as the Afghani people exercise their right to self-determination and govern their internal affairs seems almost alien to those who cape for the continued colonial occupation. To these people, the entire world is just a playground for America to act out its twisted hero myths against darker peoples, a playground in which America doesn't need permission to manipulate as it pleases. But to the hundreds of millions of people who have been the victims of American foreign policy, the rationalization that America must keep colonizing their homelands to prevent "absolute Hell' from descending upon them reads like a sick joke, particularly as the real hell is very often a product of American intervention. There are justifiable causes for intervention, but I cannot think of one that would permit America to continue colonizing Afghanistan into perpetuity, particularly with America's record.