How often do we reliably know why we're feeling upset?
Studies have shown that humans generally overestimate their intelligence. Externally this makes sense because based on the knowledge each individual has, they think their decisions are the most logical, and are unaware of all the reasons why they're wrong.
However, I'm wondering if this still holds up internally. Let's say a person experiences event A and event B on the same day, both are negative. They're sure that they're upset because of event A; believing event B was just a minor inconvenience. However, they actually would've been happy if event B never occured and relatively unaffected if event A never occured. How frequently do scenarios like these happen?
To be clear, the anger is drawn from the event itself and not future events it catalyzed (eg. event A caused XYZ to happen and that's why the person is upset) because that goes back to the knowledge problem