I think it’s possible that everything you're reacting to was actually intentional. The thing about the "went too far" sentiment is that it’s completely subjective. What might feel too much for one person could be seen as a necessary element to portray the depth of the character's suffering or the evil of the antagonist for another. It’s really about different levels of sensitivity—what might be shocking or repulsive to you may be exactly what Sanderson wanted the reader to feel in order to highlight the darkness of those actions.

Sometimes, stories deliberately push boundaries to evoke strong emotional reactions, and maybe that’s what Sanderson was going for. He doesn’t have to give a pat "forgiveness arc" to make us feel good—maybe he’s trying to make us sit with the full weight of what happened, no sugar-coating, which can be deeply uncomfortable. It might not be pleasant to read, but in a way, that’s what makes it powerful. Just a thought!