I think people should be angry at things that are worthy of anger. Injustice is outrageous and deserves outrage.
More Chris Hayes quotes :
Successful prime-time television of any genre produces some kind of emotional reaction in the viewers. There are a lot of different emotions to tap into. The emotion of the reward of discovery, the feeling of righteous anger, the feelings of pathos and sadness, or sentimentality of being moved by something.Chris Hayes