Apart from the so-called 'demonic pollution', there is also the so-called 'medicine' that can make people let go of their moral dams.
Since it is not possible to spread demonic pollution openly on the earth, let's first make people become in a state similar to being polluted by demons.
This is very reasonable.
"Most of the students in the martial arts gym are from middle-class families. Such people have some money, but only some money."
"Can't go up, can't come down."
"I'm not sure whether I can really become a traveler. There must be a lot of confused little lambs out there."
"It is indeed a better dumping place."
Chapter completed!