Everyone gets angry. At some point or another. At least maybe just frustrated. But if you were to hold that anger towards someone, Or something, You are pretty much stating you are incapable of handling the situation properly. Like saying you are wrong to yourself over and over and you cannot calm yourself to move on.
Although we, As human beings have every right to be angry, It is ridiculous to let it blind our conscience. Being capable of holding back the anger to eliminate any potential urges to make destructive decisions is what differentiate a fool and a rational. Anger is an innate toxin. Only you can be the sole victor to defeat it.
Maintaining anger without any direction is without any doubt foolish. However, The importance of anger in directing conversations about rights and values is undoubted. Anger is the passion that fuels your fight towards freedom. Anger makes you go out on the streets asking for a change. If you are not driven by anger at injustice, Then what pushes you forward to make a change?