I see this sort of thing often. Often rather than simply swapping back and forth, someone will go through a long chain of switches, going from arguing for A, to arguing for B, then for C, then for D, and then finally going back to A, and forgetting that we ever discussed it in the first place. In fact if you analyze the torture / dust speck discussion you will see that many people did this very thing.
I see this sort of thing often. Often rather than simply swapping back and forth, someone will go through a long chain of switches, going from arguing for A, to arguing for B, then for C, then for D, and then finally going back to A, and forgetting that we ever discussed it in the first place. In fact if you analyze the torture / dust speck discussion you will see that many people did this very thing.
Bonus points for, instead of forming a circle, leading the chain off topic and forgetting whatever we were discussing in the first place.