I've had this thought and decided to share it here, both for the sake of sharing something interesting and to know if it made sense.
Given that scum can be caught by perspective "slips", or more exactly perspective dissonances, and given that those dissonances are quite common, the concept of doublethink is interesting for successful scumplay. The possibility of convincing yourself that you are town and do not know the scum, even though you have read your rolecard, could prevent perspective dissonances. Therefore, "fooling yourself" while remaining in control (to push mislynches instead of teammate lynches, for instance) could be the key to the most natural and effective form of scumplay ever. You'd basically have to be O'Brien for the duration of the game. That seems... interesting.