The problem with mob justice is that it can be leveraged directly in to fascism. This is exactly what happened with the French Revolution and the Soviet one. In both cases valid anger against oppression was directed in to paranoia that allowed for the reestablishment of an authoritarian order instead of liberation. Anger is foolish and easily manipulated. That’s why it’s the only emotion the right wants anyone to experience. That’s why it’s the only emotion patriarchy allows men to express.
Anger is good for destroying things. Some things need to be destroyed. But those things that need to be destroyed are systems, not people.
Anger is activating and should absolutely drive you to action, but the action you take shouldn’t also be decided by the anger. Let anger wake you up, and compassion guide the action you take.