But, knowing about something and being able to prevent it from happening to the ones she loved, were completely different. She could easily see the change that intense training in the Dark Arts brought on the personality and psyche of Ron. His private teacher was able to drag the worst parts of him out, twist and exploit them, and engineer the perfect little soldier for the Dark Lord. She witnessed him be broken to nothing and rebuilt from the leftover parts. Very little of the boy she remembered from Hogwarts remained. He was almost a machine of destruction with very little thought for anything else. Hermione would've wept for the loss if she had anything left in her to care.