The TED talk by Ruth Chang gets at some of the points I’ve made before, namely that reason only carries you so far, and that reason exists to serve intuitive goals. This comes out in hard decisions, when reasoning by itself is often insufficient, and we have to fall back on our innate values, on who we want to be.
Chang doesn’t mention morality here, but moral decisions are often some of the hardest decisions we have to make. All of it takes us back to the brute intuitions, to instincts, that guide our actions. Reason is definitely useful in helping us identify what those values are, but not in telling us what the primal ones should be.