"It’s more than a "defect,’ sir, when you consider that Cousin John, and his Death Eater ilk, sooner or later will come after Hermione Granger, who’s my Muggle-born betrothed, and they’ll come after her Muggle parents. I don’t like killing; but I’ve killed thirty-nine Death Eaters who, so far as I know, never ever attacked me first, just to make Hermione and her parents safer."