Misdirected emotion
Have you been in situations where you were hated before you were ever introduced?
Have you disliked someone for the reason that he was given a certain position without your consent or contrary to your hopes?
Most people do not take the time to understand why they are upset.
When emotion rules, logic and reason find little place. Add misdirection to that emotion; you might as well flush logic down the drain.
Emotion is important. It is integral to the human system. Let your reason hold its reigns, lest your decisions run amuck!