Why was divination taught at Hogwarts?
Just for that subject, Dumbledore had to hire a fraud like Sybill Trelawney. I know it was because of her prophecy that Dumbledore and wizarding world knew about Harry Potter and the end of Voldemort, but she wasn't predicting anything real during her time as a teacher (except the one about Dark Lord rising again).
How was divination helping students in Hogwarts?