Agamemnon

Agamemnon is a really depressing play, which i guess is a common characteristic of a tragedy. It was hard for me to decide whose side I was one between Agamemnon and Clytemnestra. How is it fair that killing a King is so much more of a crime than killing an innocent girl. I was already a little negative towards Agamemnon from the Iliad when he was so obnoxious to Achilles. It is also understandable Clytemnestra's rage at losing a daughter at the hand of her own husband. There was no other possible revenge other than killing him, because he murder was not deemed a crime.

It is interesting how different authors take on the same characters to write about. Agamemnon shows up in the Iliad and has his own tragedy. His wife is also mentioned in the Iliad. How did these characters remain constant through different stories?