Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: @DSWT I despair at this madness! It's beyond #shocking it's cold blooded murder!  How long will #SouthAfrica stand by &amp;watch #WorldRhinoDay
This tweet contains emotions: 
anger, disgust, sadness, surprise