system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Wizard's Woeful Incompetence

How in the world has the wizarding community in general managed to keep itself a secret for millennia when most of them don't seem to know what electricity is? Don't they have a rudimentary understanding of physics and subatomic particles? It seems like everything is rather precariously balanced on the verge of almost-being-found-out-ness. What if a muggle leant on the window into St Mungo's? Mind wipe, yes, but seriously, it must happen every few weeks. What if a muggle found a moving photograph? It seems impossible that absolutely no muggles have ever, *ever* seen a wizard perform magic and told anybody.
gpt
There's a lot of charms to protect witches and wizards. They can make objects impossible to mark on a map, including satellite. They can make it so Muggle minds absolutely cannot focus on, or even see, an object. Of course, there's the memory wipes, but those are a last resort. If a Muggle picked up a moving photograph, the person depicted would probably stop moving or vanish.

Keep in mind also that they work with Muggle governments fairly easily. A dozen people could report seeing a battle over the sky with broomsticks, and most Muggles would think them mad. And, if it were reported, the Muggle Governments would cover it up.