Determine the emotional tone of the following tweet: "@mikeburke91 @AP I guess. It's just heartbreaking the ease with which they can kill an innocent man and get away with it.". Use the provided emotions: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. Respond with the emotions you identify or "neutral or no emotion".
anger, disgust, pessimism, sadness