Some readers might think Agamemnon was very cruel and selfish to sacrifice his daughter to appease Artemis. From the standpoint of his family, he was really cruel. But from the standpoint of the king of Mycenae and the leader of the Greek army in the Trojan War of Homer’s Illiad, that was the only thing he could do. Agamemnon faced a dilemma before making his decision and went through a painful inner conflict. Although he loved his daughter and family, the Macro-benefit was always the king’s priority to consider. His special identity would be doomed to his choice.
A similar moral conflict applied to Clytemnestra’s revenge. From the standpoint of the family interest, some readers might think the way she revenged for her daughter seems acceptable. But she was not only killing her husband, but also the leader of the city, which would affect the safety and stability of the city. Based on that consequent, Clytemnestra was cruel, too.
The conflict of the benefit between family and power leads to the whole tragedies. Aeschylus lets us consider the situations in multiple perspectives: Whether the special identities of the characters in the play or the special situations they face. It’s hard to judge the absolute right or wrong of a fact.
Tragedy becomes tragedy because people have to make painful choices. Oresteia is telling a story about the tragedy of revenge circulating among blood relatives. As you mention in your blog, everyone has a reason for their revenge. Lastly, the trial for Oresteia also shows the power of males.