What is the theme in I Go Back to May 1937 by Sharon Olds?

Grief and loss make up the main theme of the poem. This poem reveals the speaker's grief and anger at the misery her parents' marriage has created. The speaker establishes her grief and pain through her choice of language to describe her parents. She describes them as "kids" who are "dumb." While they would never deliberately hurt anyone, the speaker admits they did cause a great deal of pain. The speaker's loss is most acutely felt when she describes their innocence. She tells the reader, "they would never hurt anybody."