I think you’re appealing to the boiled down and stripped away “mindfulness” movement in the west that focuses on creating what I call “Vipassana Zombies” - people who can feel their sensations just enough to recognize and ignore them. A lot of Buddhist teachings are about empowerment and action, and they’ve been grossly misunderstood.
"You will find peace in action. Join an eco-guerilla cell. Use your rage to guide your contribution to the cause - it is a valid emotion driven by a need for change. Long live the revolution! For Victory! For Justice! For Peace!"
The more you resist the anger the more it will persist.
Acknowledge your anger, yes. Then acknowledge your control, not only over how you express it, but even over whether you feel angry or not. It is possible to develop the skill to stop being angry. This is far more important than going with the flow.
It's often a bitter pill to swallow, because it means the people that act out of anger, or are always angry, are ultimately responsible for how they feel. It is not someone else's fault you feel angry.
Often that amounts to changing the people or circumstances in one’s life. That’s the point of therapy. A good therapist wouldn’t help a sexually abused child stay in a bad situation and just learn to suppress emotion. Well maybe a cbt therapist would. But a good therapist would try to help catalyze a change in the situation causing the trauma.
An equally valid narrative is that, especially in our society where most people have repressed anger, once anger is tapped into, there’s an overwhelm of backlogged emotion that is also released. Anger as an emotion is energetically expensive for a biological system, and it doesn’t make any sense that it would continue to be reinforced indefinitely.
The path forward is to understand the anger with compassion, and the trauma or painful emotions below it, or the boundaries that are being crossed. Rather than just trying to force yourself not to feel it.
It's not that different from telling a depressed person that they should just think positively to cure themselves.