Oh sure, it's probably just people being idiots most of the time! But not always.

[Adachi doesn't disagree, but people believing in ghosts is funny to him, so he encourages it.]

Some wise old guy. See, sounds like you've got it all figured out. They need detectives everywhere, because of how much people love to commit crimes. There's always going to be more people causing more trouble. It's a growth industry!