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As others have explained, if a story is written in first person, the readers expect to be privy to the POV character's opinions, thoughts and feelings. This is true of third person limited too, and...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/39487 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/39487 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
As others have explained, if a story is written in first person, the readers expect to be privy to the POV character's opinions, thoughts and feelings. This is true of third person limited too, and even an omniscient narrator would get into characters' heads. However, this does not preclude the readers from forming their own opinions. They might, after all, disagree with the POV character's evaluation of a situation, or even their approach to the main conflict. The POV character might well be mistaken about something, and perhaps be made to pay for their mistake. There is nothing underhanded about using the POV character's inner thoughts to fuel conflict. It is, in fact, quite commonly done. Consider, for example, Jane Austen's _Pride and Prejudice_: the source of the main conflict is the main characters' mistaken opinions of each other.