Do you agree with Salazar Slytherin that Hogwarts should only teach magic to Pureblood Wizards?

No, because if it was only pure bloods being taught, then you'd have mudbloods running around, trying to teach themselves magic...Besides, Voldemort isn't a pure blood, his mother was a squib and his father a muggle. Look at Neville, pure blood and useless when it comes to magic. Then there's that know-it-all Hermione, a mudblood better than everyone else...