It is Rowling, not Dumbledore, whose character we must assess. And like her Half-Blood Prince, Rowling has already proven herself too slippery to be second-guessed. The safest bet might be to surrender our minds (and our money) to her literary genius.
Written in 19th-century English reminiscent of Jane Austen, these brilliant stories include a retelling of "Rumplestilskin," a tale of Mary Queen of Scots, and a folk tale about a famous magician king.
If you are interested in the civil war, the ethics of slavery, the life of a Union chaplain, or just an interesting read, this novel by Geraldine Brooks might be for you.