Fear is the path to the dark side. Fear leads to anger. Anger leads to hate. Hate leads to suffering.
Yoda - Star Wars Episode I: The Phantom Menace
Anger, fear, hatred should be seen for exactly what it is. An emotion. Something that happens. Something that cannot be controlled as it is.
Nothing more, nothing less.
And emotion serves as a catalyst. Nothing more, nothing less.
It may lead to other emotions. It may lead to action. It may lead to good, and it may lead to evil.
Anger may lead to a curiosity to understand. To understand why. And in understanding why, it may lead to ridding that anger.
Fear may lead to a definition. A definition of who we are. In knowing what we are afraid of, that definition may lead to a confrontation of our fear, for we cannot face something that we do not know.
Hatred may lead to action. An action that will lead to greater good, for in protecting that which is dearest to us, it may lead to the preservation of life.
Of course, all the above may still lead to death and destruction. Hell, the above may be exactly that. The trick, therefore, is not to control our emotions, but to control our reaction to that emotion.
Because what may come of that emotion, is a reflection ourself.
Not that emotion itself.