it's more reasonable for Prismattic to complain to the incentive setters than to the incentive followers.

I disagree with this, at least it's not at all obvious.

does that mean

It means that at least on LW, they would also describe their behavior as rational (in certain contexts where reason is seen as an enemy, not everyone would be claiming the title "rational").

these are two different things and the saying uses the plausibility of the disjunction of the two things to suggest only the first thing.

Clever.