Yoga has us to face the parts of ourselves that, at one point in our lives, we have shunned. This is a painful shift in perception, yet it is through this wholistic awareness that practitioners of Yoga transcend to the true Self.
The deep discomfort of unprocessed pain is felt and seen globally. Whether it be because of a lack of know-how in dealing with the pain, or in aversion to this pain, we see clearly the violent flames continue to burn and spread (addiction, violence, etc). These actions (that are a result of our pain) are not only the dance of our individual Karma's but the process of destruction that is in fact necessary for rebirth.
A true practitioner of Yoga is one who is brave in their quest for Truth. An honest believer in Yoga is one that has Faith in the destructive fires of our painful experiences. A diligent student of Yoga exercises ancient methods of Self-realization to ensure that all that is to be removed - is removed.

"It is not light that we need, but fire; it is not the gentle shower, but thunder. We need the storm, the whirlwind, and the earthquake.”
~ Frederick Douglass (1817-1895)