Sometimes the pain of being a victim is externalized as anger as a person takes their power over their will back.
This is good as we must own our emotions to change them. As a victim, someone else is holding our power and we have no authority to change.
Anger at others is misdirected unless you have some power over their behavior (i.e., as a leader...and even then the change has to be inside yourself as to how you are managing them).