You're right about the human nature. There are plaenty of times when I have something planned and players statements stop me from carrying them out, BUT that doesn't change the overall story. If The dragon orb falling into the hands of the red general is going to cause the rise of the dragons it will happen whether the party gives him the orb is session 32 or he takes the orb in session 45. Small paths might open and close but your intuition will not change the overall goal.
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Yet I think you are confused. If your character acted on his suspicions of the the white wizard, it wouldn't change whether he's evil or not. It might change the manifestation of his evil but he would still be who he is. You are paranoid if you think entire campaigns change because you figure out the bad guy's scheme, that's part of the Roleplaying Experience.
The issue arises when you have plans and ideas but instead of roleplaying these ideas through your character you talk about it outside of game days later. If Charles deduces that the people offerng to ferry the PCs to a remote island are shady pirates but Chucky the Stout(Charles' evil doll construct) roleplays kicking people on the docks or sitting in the corner avoiding the other PCs Charles can't get credit for good roleplaying or deductive reasoning. There was no roleplaying actually being done.
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Yet I think you are confused. If your character acted on his suspicions of the the white wizard, it wouldn't change whether he's evil or not. It might change the manifestation of his evil but he would still be who he is. You are paranoid if you think entire campaigns change because you figure out the bad guy's scheme, that's part of the Roleplaying Experience.
The issue arises when you have plans and ideas but instead of roleplaying these ideas through your character you talk about it outside of game days later. If Charles deduces that the people offerng to ferry the PCs to a remote island are shady pirates but Chucky the Stout(Charles' evil doll construct) roleplays kicking people on the docks or sitting in the corner avoiding the other PCs Charles can't get credit for good roleplaying or deductive reasoning. There was no roleplaying actually being done.