he's pointing to nonduality. he is a butterfly and each and every thing else. he even includes what people would label as very bad as himself. he is pointing to no separation, embodying it, and not apologizing. he is saying he is the little girl in the poem as much as the aggressor as much as a butterfly as much as each other thing in the poem.
that will help. it's a brilliant poem. i think a certain person from long ago whose name begins with J would be eyebrow to eyebrow with TNH if he read it.