Measure for Measure Questions

My biggest problem with Measure for Measure is that all of the characters get what they deserve except for the Duke. He merely snags Isabella, out of a convent no less (thus forcing her to break her vows), and never gets punished for manipulating everyone around him.

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I'm confused; Angelo is the bad guy in this tale. The deputy trounces on everyone and is later spared by their benevolence.

Source(s): Measure for measure