When you learn about spirits or tendencies, you'd figure out that different areas different locations or sites, has different spirits that ruled there. By knowing about this, you'd figure out where do the tendencies of killing resides, the tendencies to steal, the tendencies to lie, the tendencies to corrupt. Even when you don't know who are the people that are going to be used by the tendencies. And imo its less efficient to look for the "evil people", because spirits could just make another form of administrations, one way or the other. Now when you could measure or meter the level of likeliness of these tendencies would manifest, and compare the results with reality. You'd notice that there might be some differences. These differences could be due to administrations used to surpress these spirits. Therefore we don't need no hero in urgent circumstances saving the day, just to identify who to give thanks to... By looking at the difference