We are seven

The poem "We are seven" by Wordsworth seems to contradict Blake's idea of innocence and experience. The little girl demonstrates signs of innocence when she portrays her idea of death at the beginning. The narrator symbolizes experience when he questions the little girl's childish thoughts. However, she, seemingly stubbornly, refuses to accept his perspective, even after his doubts persist. She claims the children are still connected even though they are dead. What is truly interesting is that she still holds generally innocent views even after she has gained experience--she still believes they are together as seven even though she knows and understands that they are dead or gone. I suppose an argument could be made against her truly understanding that they are dead or gone, but I like to think that she does because she listens to what the man has to say and still believes they are seven.

One thing that I don't quite understand is why there is that little intro (the first stanza on page 377), or what it means. It seems to me like the poem doesn't need this verse.