While he obviously had his faults, Lord Voldemort was a powerful man, and an interesting one. His occasional correspondence with her was very illuminating, and she could tell he didn’t really want to rule over the Muggle world, or he’d be a lot more successful with that agenda by now. His real goal was obviously more about winnowing out the angels’ descendants and supporters from their midst (whatever their blood status), and fostering the Dark’s agenda. She quietly suspected he might be more than a little mad, but that wasn’t something very safe to talk about. Having some of his Horcruxes destroyed probably wasn’t helping him stay sane – having bits of your soul annihilated couldn’t be good for you. Despite that, she still shared tidbits of information with him whenever Harry confided in her (instances that had become increasingly rare ever since she’d moved to Durmstrang and they’d drifted apart). Lord Voldemort appreciated his young ally’s gifts of demonic aid for slaying or terrifying the occasional particularly troublesome opponent (even though she stubbornly refused to send any of them against Harry). He just didn’t have the way with demons that she did, with his more tightly controlled approach to calling demons only in highly restrictive rune-inscribed summoning circles – he focused on getting their help to improve his personal power, rather than gaining their active physical service. House-elves – imps – he outright scorned as creatures too weak to be of any aid, an attitude she didn’t bother persisting in trying to correct him on.