Hypocrisy;  he exposed the Light’s rabid fascination with the worst aspects of the Revolution, and the overblown rhetoric that had been used (then, and now) to demonize the Dark. Did they all desire to murder each and every Muggleborn, or drown them all beneath the chains of servitude? Yes, some of them. But power begot power, and the Dark Lord needed the fanatical support that accompanied the money of the Old Families in service to his stance against the Ministry. That those particular firebrands had been phased out? Early on, and with extreme prejudice? That soon into their nearly decade long conflict, methods for integration instead of isolationism with the Muggle world had been put forth? They were monsters, yes, but monsters with the purpose of supporting a  greater society.