To show a positive example, without word redefinitions: IMHO western society largely managed to end prejudice against left-handiness, while keeping the word "right".
(And this "left -> bad" or "right" -> good (or both) association is as (or more) prevalent in languages of the world as the "dark -> bad" association)
(And this "left -> bad" or "right" -> good (or both) association is as (or more) prevalent in languages of the world as the "dark -> bad" association)