“Blood will have blood” Do you believe in revenge? Why?

Indeed I do believe in revenge, because when someone scars your heart and damages your trust, that feeling can’t compare to most physical pain. I believe in revenge to show someone that you are not an easy target that should be a repeat offender. It is for a lesson to be shown and for a statement to be made. Blood will always have blood which was shown in the wars in the past, which has made the world where it is today, but I do not believe that revenge should be done to a fatal state but certainly to a bold statement.