Pretty self explanatory, logs that give the information that two people are in the same faction are just way too powerful.
One personoid can easily get discovered because the other one messed up previously and the same faction log popped up, and even when the two people indicated are residents it allows you to clear1/3 of the players in one go.
I wish we could at least deactivate these types of logs in custom games, or just not have them in general.