1 Cor 6

Do you not know that the saints will judge the world? And if you are to judge the world, are you not competent to judge trivial cases? Do you not know that we will judge angels?

Anger is an emotional response, created by God, just as joy, just as sorrow. But the corrupted heart of a fallen man can turn anger into unjust, unrighteous, selfishly driven anger, joy into avaricious joy, and sorrow into sorrow for self, with disregard for others.

It is not the emotion that is at fault; God created us with the capacity to experience all and every emotion that He himself experiences. Rather, it is our fallen nature that is at fault. So, yes, there is righteous anger (if it is not rooted in your selfish or immature heart), and God desires that we judge the world, NOT from a selfish, immature heart, one that disregards mercy, compassion and understanding, but with a mature heart that does not slip into selfish, self-righteous or destructive judgemental heart.

If you are incapable of these things, you are still merely an infant, spiritually.

It's like the man who NEVER touches alcohol because he is incapable of actually NOT being influenced by it, and so abstains from a place of weakness, not from a place of strength.

Matt 15:11 What goes into a man's mouth does not make him unclean,' but what comes out of his mouth, that is what makes him unclean. '

The content of your heart is what makes you unclean, not the act, and not the emotion.