they literally do not have the capacity for it. (Unlike mortal creatures who have the capacity to direct their alignment and morality, intrinsically good creatures - as pixies are - don't.)
Huh. I was not aware of this. I assumed pixies, while typically having very spesific behaviour and alignment (though I hear WotC hates alignment now and wants to do away with it or something?) still could behave outside of that. Learned something today then, thank you
