The poem the Cremation of Sam Mcgee would not be a poem if it did not rhyme.
Poetry requires rhyme. It is the art of rhyming that makes any piece of poetry valuable. Beyond this, without rhyme the listeners would be less interested in the story as one of the main assests of this creation is its use of rhyming structure to keep us hooked on the tale.
Yes, making choices on their own is important to how people live and their independence. It gives them a sense of value and ownership to their own thoughts, emotions, and decisions in life.
That's the best I got for an answer.