Negative emotions may also be the unconscious learning experience that most people use to create deeper states of self awareness.
Let me give a couple examples.
Depression is the unconscious way of learning introspection when there is no time spent in conscious (deliberate) introspection.
Fear is the unconscious way one learns imagination, and sadness is the unconscious way of learning empathy.
When the positive learning aspect of the negative emotion is ignored then only the negative emotion is left for the learning experience. Most people do not look to the positive lesson gained with the negative emotional experience. When one concentrates on the positive aspect of the negative learning experience and gains the lesson, one need not draw in the negative emotional experience more than once.
We learn consciousness and balance either on purpose or we get kicked, battered, beaten, emotionalized, or traumatized into our own growth.
Just another way of looking at negative emotions.
Watch your thoughts, they become your words.
Watch your words, they become your actions.
Watch your actions, they become your habits.
Watch your habits, they become your character.
Watch your character, it becomes your destiny.