A bit of 
ANGER helps us mobilize and stand in front of unfairness!
Well guided anger can be useful.
Strong focus extra energy and determination are the strengths of constructive anger.
Applying them can make our response to injustice more effective.
If strong anger takes over the 3 strengths of constructive anger are transformed and
strong focus becomes obsession
extra energy becomes agitation and
determination transforms in lake of self-control
…And so the anger becomes destructive!
In order to be effective in case of injustice or harm making situations, we need to learn to keep a cold mind study the situation and then take a counter measure.
If we let a wrongdoing happen it might continue or even increase so is right to act BUT you need to do it in a constructive way.
A Mentor can help you strengthen the ability to activate, when needed, constructive anger!