Aside from Grindelwald, the entirety of the wizarding community does so; though, to be fair, we cannot blame them entirely, as it is a direct consequence of the segregation and isolation they imposed upon themselves.

The perfect example to contrast this occurs in The Dresden Files novels, a series about a wizard who helps the Chicago Police Department fight supernatural threats. In that universe, the average wizard is far more destructive than the average wizard in Harry Potter. All kinds of supernatural beings exist there (wizards, vampires, werewolves, etc.) and, just like in J.K. Rowling's work, they hide from normal humans. However, the protagonist himself, Harry Dresden, explains the exact reason for this secrecy: a spell can be highly powerful, but it will do you no good if humanity throws a tank, bombs, napalm, or nuclear weapons at you.

The crucial difference between both worlds is that in Harry Potter, wizards did not just hide—they isolated themselves completely.…