Anger, you have again touched on an important issue. Yes, there is a strong correlation between anger and power. What then, when one internalises that anger? What about the person that has no outlet to express that anger or the power of being powerless. That individual has no option but to lash out at themself. They become self-loathing and demoralised, which then translate into low esteem. The individual then sees the self through this prism, of self-loathing and helplessness. The powerless becomes so angry that the only way appears to be the eraser of the self.
One can then argue that individuals need to contextualise their anger. They need to express that anger and apportion it to the person or thing that has induced that anger in them. Again, very well written and presented.