Harry paced around his bedroom, putting the events in order and looking at them through a new filter. He kept coming back to the fact that while the Death Eaters committed the acts, Dumbledore often set the events in motion or complicated matters. And he saw nothing wrong with manipulation if it got him what he wanted. The Longbottoms didn't agree with him, so he arranged for them to be removed. Bellatrix and Couch may have performed the act, but Dumbledore manipulated Augusta into betraying her family numerous times. He made Remus into an unquestioning flunkie, willing to die for Dumbledore's cause. His poorly thought out cause. It failed before and Dumbledore simply repeated it. Shacklebolt and Tonks could have been fired. As died before telling her, Harry assumed he never intended to let Hermione discover her ancestry She implied important knowledge would have been lost. All because Albus Dumbledore didn't know how it would benefit him. So he denied her of it. Then he made her into a walking reference tool for Harry.