This is further explored in other novels, and is notably covered in some depth in "The Tales of Beedle the Bard", where Albus Dumbledore writes notes after each story that often concern Wizard-Muggle relationships. Part of these 'observations' note how The Tales were modified in the face of anti-Muggle sentiments, in order to remove any pro-Muggle messages for wizards who did not want their children exposed to those messages. This included Lucius Malfoy, who demanded that the Tales be removed from the Hogwarts syllabus.