There seemed to be very little air in Harry’s lungs; his breathing was quick and shallow.
“And Kreacher told you all this… and laughed?” he croaked.
“He did not wish to tell me,” said Dumbledore. “But I am a sufficiently accomplished Legilimens myself to know when I am being lied to and I—persuaded him—to tell me the full story, before I left for the Department of Mysteries.”
“And,” whispered Harry, his hands curled in cold fists on his knees, “and Hermione kept telling us to be nice to him—”
“She was quite right, Harry,” said Dumbledore. “I warned Sirius when we adopted twelve Grimmauld Place as our Headquarters that Kreacher must be treated with kindness and respect. I also told him that Kreacher could be dangerous to us. I do not think Sirius took me very seriously, or that he ever saw Kreacher as a being with feelings as acute as a human’s—”
“Don’t you blame—don’t you—talk—about Sirius like—” Harry’s breath was constricted, he could not get the words out properly; but the rage that had subsided briefly flared in him again: he would not let Dumbledore criticise Sirius. “Kreacher’s a lying—foul—he deserved—”
“Kreacher is what he has been made by wizards, Harry,” said Dumbledore. “Yes, he is to be pitied. His existence has been as miserable as your friend Dobby’s. He was forced to do Sirius’s bidding, because Sirius was the last of the family to which he was enslaved, but he felt no true loyalty to him. And whatever Kreacher’s faults, it must be admitted that Sirius did nothing to make Kreacher’s lot easier—”
“DON’T TALK ABOUT SIRIUS LIKE THAT!” Harry yelled.
He was on his feet again, furious, ready to fly at Dumbledore, who had plainly not understood Sirius at all, how brave he was, how much he had suffered…
“What about Snape?” Harry spat. “You’re not talking about him, are you? When I told him Voldemort had Sirius he just sneered at me as usual—”
“Harry, you know Professor Snape had no choice but to pretend not to take you seriously in front of Dolores Umbridge,” said Dumbledore steadily, “but as I have explained, he informed the Order as soon as possible about what you had said. It was he who deduced where you had gone when you did not return from the Forest. It was he, too, who gave Professor Umbridge fake Veritaserum when she was attempting to force you to tell her Sirius’s whereabouts.”