@thoughtpunks@LeviKornelsen@Silverlion Warmer, but missing the fundamental problem of "how do I get players to understand to even try these things, and how to do so?" Carrots and (especially) sticks for actions/inaction the players don't understand would just seem arbitrary.
Basically, I get the sense that a lot of people interpret mystery plots without any concept of them involving reasoning; in a cooperative game like your typical TTRPG, that reasoning should be done as a group.