These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Night Lords
Alternate Character Interpretation: The Night Lords are either deranged psychopaths who live only to sate their appetite for terror and destruction or misunderstood anti-heroes who fight against the corrupting influence of Chaos while simultaneously extracting revenge on the Imperium which abandoned them. Both interpretations are equally valid in the present and no one fully remembers what the Night Haunter was like or the extent of his original vision.
Zso Sahaal is also shown in two different lights. He is either a tenacious hero trying to keep the remnants of the legion sane by uniting them under him, or is a deranged and naive idiot with an inflated sense of self-importance. Notably, the second interpretation is how the writer of the Night Lords series views him and portrays him in the eyes of other Night Lords, while the first is how many fans of Lord of Night see him. Talos also can be seen in a less extreme version of either interpretation.
It's later revealed in Void Stalker that Aaron Dembski-Bowden doesn't really see Zso Sahaal as a self-important idiot, but it's how Talos sees him, with Mercutian and Uzas saying that they respected Sahaal.
Konrad Curze heavily invokes this. Did he champion "order through fear" as a means of ensuring justice yet reject Chaos itself at the same time as joining Horus, like Sahaal and Talos claim? Was he as thoroughly corrupted as the other Traitor Primarchs and desired his sons to feed on fear like Acerbus claims? Or was he just a broken maniac like Xarl and Lucoryphus claim? No two Night Lords can seem to agree on what Curze wanted.