Reen's sacrifice, Vin chose to overlook it because to her, it didn't override the fact that he was horrible to her while raising her. But he was just a scared kid, doing what he could to keep them both alive, teaching her to be just like what, to him, worked in the harsh world, to teach her not to look for him if he got caught, fully prepared to get caught, knowing he'll be tortured. He gave up his life for her way before dying, or getting captured. And even if he was horrible to her out of bitterness, he did still love her and carried through torture by the Inquisitors not revealing her continued existence.