Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: Some vile piece of scum rejoicing in the fact that you have dead children is inhuman and to say it to me is worse still. I hope karma knocks
This tweet contains emotions: 
anger, disgust, optimism