In a bizarre twist, Hagrid is reputed to have developed a close friendship with the boy who brought around You-Know-Who's fall from power - thereby driving Hagrid's own mother, like the rest of You-Know-Who's supporters, into hiding. Perhaps Harry Potter is unaware of the unpleasant truth about his large friend - but Albus Dumbledore surely has a duty to ensure that Harry Potter, along with his fellow students, is warned about the dangers of associating with part-giants.