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: So they #threaten to kill #kapernick for KNEELING. I say every athlete just stop playing until social justice and equality comes forth.
This tweet contains emotions: 
anger, disgust, fear