"I *do* try," said Luna. "Some of the others - well, they don't care so much. Or sometimes we see that the Muggle is not ready to understand and accept us, so we modify their memories so that they can remain as they were, instead of becoming confused and angry, and possibly being labelled as crazy, if they try to tell other Muggles about us.

Then there's also the problem of the Wizarding World's distrust and scorn of Muggles, which was exacerbated during the Witch Hunts of the 13th to 16th century. We never do forget." She sighed. "So the rot goes both ways, and it will take a long time to root it out."