What do the deaths at the end of play symbolize?

I think that the deaths of Antigone, Haemon and Eurydice, at the end of the play, symbolize sacrifice for a greater idea. Antigone's initial insistence goes against the edict of a king. Still, she does the right thing, to her at least, despite the threat to her life. She repeatedly tries to bury her dead brother. It is an act of heroism. All of the deaths symbolize Creon's stubbornness. In the end, he has lost everything; he has lost his family over an edict that was borne out of selfish interest and pride.