What it had boiled down to was essentially this; Draco wasn’t evil anymore, he had lost everything, he was miserable, and alone, and Hermione was pretty certain he was depressed. Hermione was the only one that was ever going to treat him fairly and give him a chance to prove himself, and therefore she felt a responsibility to do so. Plus, the more she saw of him, strangely, the less she dreamed about the Manor.