I don't think poetry needs to be "easily understandable. " First of all, there are often complexities of syntax, form, unfamiliar absences, etc. , that require a deeper concentration than is usually demanded of us. So that, right off the bat, is a little difficult. Then there is the deeper issue of what poetry is really asking of us. I feel it is asking us to read with great, even sacred, care and attention. That, too, is difficult. It requires discipline and the creation of a temporary zone of privacy, which is inimical to our current conditions of life.
Is every moment of our lives built into us before we're born? If it is, does it make us less responsible for the things we do, or is the responsibility built in too?