There and Back Again

[Mithadan]

By Galadriel55 He felt it was his duty to keep the Shire safe and hobbitishly unconcerned about the greater troubles of the world. He came back to find that he failed on that count, and he failed to keep the Shire from "growing up" character-wise (becoming worldly-wise?) even when all the repairs were finished.

This is really perceptive. Frodo began by seeking to save the Shire and lure the Ringwraiths away from his home. He then volunteered and set out to save not just the Shire but all of Middle Earth. He does not turn back even when Sam glimpses evil happening in the Shire in Galadriel's mirror, they do not turn back. When they return to the Shire, they find that they failed to do what they set out to do.