Why might Carl Sandburg have placed an emphasis on politeness among the animals in the Committee of Sixty Six and in the interactions the animals have with humans in "How the Animals Lost Their Tails and Got Them Back Traveling from Philadelphia to Medicine Hat"?

Carl Sandburg, a children's poem writer, placed an emphasis on politeness among the animals in his works (Committee of Sixty Six and How the Animals Lost Their Tails and Got Them Back Traveling from Philadelphia to Medicine Hat) in order to inspire kids who read his works to do the same - that is, being polite to others.