My anger found me and almost killed me, it was an inside job. My anger was very much suppressed and it was appropriate anger. After it started coming out it was barely manageable but I did manage it, now I feel anger at the moment it arises and manage it without having to expend so much energy. I trust the mini-anger that lets me know that there's a situation that needs to be managed...I make changes before I have to have the big anger...self-care is very necessary.
I find I can be displeased with injustice but I don't need to take it all on myself. I take care of what's around me and trust that it becomes a part of the bigger picture, ripple effect, 6 degrees of separation, greater consciousness and all that.
I can also verbally express my disappointment and chagrin and even disbelief, when I feel the mini-anger, without kneejerking. It's good to have perspective and not to become part of the problem. Many people who have anger problems and feel out of control will try all kinds of crazy-making behavior to try to project it onto you. My advice, get in a place where you can see this and back away safely.