The Tempest's Relation to Evan's Enormous Question

Is revenge something to be considered "bad" or is it "good". It is interesting how the person carrying out the revenge thinks it is a good thing because it may make them feel better. However, most people that receive the revengeful act believe it to be a "bad" thing because it is harmful to them. Prospero wanted to seek revenge on his usurping brother for betraying him and taking the throne hostage. Instead of taking revenge though, Prospero ends up forgiving his brother (forgot the name...Sebastian??)instead of harming him. This is one of the overlying morals the book places forth. It is commonly said to be honorable and worthy to give forgiveness instead of revenge. I wonder if Prospero would have taken revenge if he would be looked at as any less than he was when he didn't. Or would he feel more satisfied if he did carry out vengeful act?