With fiction we denote the un-real, the false, the not-true.
No, we don't. Fiction is, instead, a realm beyond truth claims. Only if a truth claim is made can the judgment true/false be passed.
Fiction is illusion, but by way of not making truth claims (in the linguistic sense, but perhaps also in a broader way), it goes beyond the illusion-reality dichotomy (one which we already saw was a difficult split to maintain).
Fiction is provided a democratic space, a space that is both ethical and beyond ethics - it is the latter in that it does not take place in the "real" world and hence bypasses human interaction, but by way of being such a space, it is supremely suited for the consideration of the ethical. Mistakes cannot be made.