How does what Aritostle calls our "moral sense" play into the concept of tragedy?

In this chapter from Poetics, Aristotle seeks to define "tragedy" as it relates to ... of what Aristotle considers to be an ideal tragedy and construct a working definition ... single tragic quality; it neither satisfies the moral sense nor calls forth pity or fear ... such plays, if well worked out, are the most tragic in effect; and Euripides, 9