Well, you have her father and the Kirijo group to blame for that, but those details were probably a bit too deep for it to be worth mentioning. Especially since it'd make even more awkward questions.

"Some people got a bit too carried away with seeing what they could do with the Shadows, and things got pretty bad for a while. There used to be a time called the Dark Hour when the Shadows could appear, but it's gone now, so that's not something we usually have to worry about anymore. Except for the odd cases where we do, obviously."

Yukari paused for a moment though, before shaking her head. "But... the TV world's existence did answer a few questions that I had back when that was all going on."