I asked about what happens when the hero doesn't know the villain's motives, and sometimes doesn't even know who the villain is for much of the story, and showing the point of view of the villain, or someone who fathoms him instead, is unwise structurally.
The panelist's basic reaction was denial: you can always show the motives. Even if the heroine realizes that it's her loving uncle who so evilly cursed her brother half way through the book, and the uncle himself doesn't appear again until the last two chapters -- when in no mood to explain anything.
Meanwhile, in the middle of having my heroine's elder sister being spiteful and petty and cruel to her, it occurred to me that actually, she doesn't have it in for the heroine. She is furious with anything -- animate or inanimate -- that thwarts her in anyway.
So how to make this clear in the first two chapters before she rides off to heroically rescue herself from a curse and ends up heroically captive and not to see the heroine for many chapters, in a single point of view book.