Pedos are often sociopaths, and sociopaths are really good at getting into positions of power.
This. Oni are a type of yokai, which have more in common with the Hellenistic concept of the daemon than anything else.
Daemon=/=demon or angel. It's a spirit or a lesser deity or the personification of something. Not inherently good or evil, it just is. It's why a lot of Shinto revolves around respecting the local land and spirits, so they'll respect you back and shit.