If the reader/listener doesn't "get it", is it the poem's fault?

The Poet's Message

What sort of message-
what kind of man
comes in a message?

I would
get into a message if I could
and come complete
to where I can see
what's across the park:
and leave my own position
empty for you in its frame.

Roy Fisher

Thank you Steven.......I think?

Thinking is good.

To clarify:

A poem is not a message. It's a poem. It may contain a message. It may contain contradictory messages. It may have no message, just a form of words, a set of observations of the poet's world, a musing thought or thoughts, a reaction to events.

If you want to send a message, go Western Union (Sam Goldwyn.)

As usual there is no easy answer. Sometimes the omission of a comma changes the meaning therefore you would say it is the writer's fault that the reader doesn't get it. In other cases the writer may intend for a word to be stressed so should highlight or underline the word...though that may not always do it.

Sometimes the writer's sense of humour or angle is not understood by the reader,...this is no-one's fault.

I think in conclusion, provided the writer has used correct spelling and punctuation, and done their best to highlight appropriate words? The onus is on the reader to get it, which may involve several reads.

A poem has both the meaning of the writer and the meaning of the reader. Being irritated that your intention didn't translate when read is natural if it is very important for you that you be understood, but really, misunderstanding should be a boon. Now your poem has more layers to it. It is open to discussion. You can see it as more than what you wrote.
Consider the process of raising a child. You have all of your intentions, and so obviously, frustrations occur when your child rebels, as they are almost certain of doing. However, you find later that your child did not reject you, but instead, became a person of their own, and that is when you realize that you are proud of them, no matter what.
Poetry is the reader's as well as the writer's. The reader imbibes your words and their own experiences and tendencies are displayed upon your intended meaning, changing it. This only evolves the poem. It creates an individuality. The ability of a reader to relate to your work shows that it goes beyond specifics. It grows, and so will your perception if you can allow all comments at least some consideration.