I have noticed repeatedly that many people seem to believe that experiencing feelings of anger and/or depression are symptomatic of being less evolved, therefore, rather than recognizing that these emotions are normal human feelings, they tend to deny these feelings and, hence, have trouble accepting their own humanity. Very often these same people are motivated to make others feel guilty about  having angry  feelings and that is projection. If we can't accept and love our own humanity, how the heck can we accept it in someone else? I perceive this type of anger as the result of the deep pain we can feel when we address human or animal suffering and our hearts literally hurt for the suffering. This anger stems from love. We can employ the anger to make positive changes if we  attempt to understand it and do not allow it to get out of control, which is the real problem. When we experience anger in the cases of witnessing injustice, I believe it is the result of believing that we are powerless to help ourselves or others.  I analyze it this way; as human beings, we develop feelings of anger when we feel threatened or perceive injustice and that anger is a coping mechanism for the grief  and sorrow we feel and the sense of hopelessness. At those times, I recommend that we keep our anger and fear in check by taking a deep breath and remembering Our Father's unconditional love for all of  us, all of the time, no matter what we may be feeling and by knowing that good will prevail. I also recommend making a plan for positive action.