We cannot defeat an enemy without fully learning his identity. The disappointment, sadness, fear, or hate some people may be currently experiencing are not enemies. Righteous anger may be the best tool we can have at our disposal to overcome those other feelings if we exert anger mindfully.
Our real enemy, I believe, has been our inability to accept our present-day existential reality —whether all of us can survive as a free nation— and, as a result of that knowledge, to fully trust ourselves in order to effect real, extraordinary change.