Poetry*Purpose

Is there a purpose to poetry? With this comes the question of whether there is a purpose to any single thing. From this, then, what is a purpose? To this, many scholars and philosophers have spent time over, though as this isn't about them, I shall supply my opinion.
   A purpose is the reason for something, and for me, something can only have a purpose if it is given a purpose. For example, I could make a cup of tea so that it could relieve my thirst, so this has a clear purpose. If a couple plan to adopt a child, and so the purpose of that child, in an obligatory sense, is to be adopted by a couple.
   But these two are planned happenings. How about accidental happenings: can something accidental have a purpose? Arguably, nothing is truly 'accidental', but it is a concept that makes sense so I shall stick with it. Something completely accidental such as an unplanned child has no purpose. What is this child fulfilling? Maybe a mother's need to love, but this child wasn't made to fulfil this purpose. I just happens to do so, meaning that a purpose can be given to accidental things, but they don't contain their purpose 'innately', such as the cup of tea.
   So, poetry. It's purpose? Well, if things have to be given a purpose, then purposes are subjective, so perhaps in line with the very nature of poetry, a poem's purpose is subjective. I see poetry as an expression of a particular feelings or sequence of events, perhaps even a standstill in time. As stated on my Poetry Page, haikus are my favourite, though I tend not to write them. They are something to read and take pleasure in the reading. Poetry, then, has two purposes for me, both the expression of internal feelings and the external poem creating, storing, internal feelings.
   In other words, internal feeding the external and external feeding the internal.