Answer:
1. help readers focus on the message rather than the structure.
2. dark and somber
Step-by-step explanation:
The tone is hollow man is dark.
"This is the dead land
This is cactus land
Here the stone images
Are raised, here they receive"
It's verses are sinister and evoke a sinister sensation. By using free verse, the author might make you focus on what he is saying instead of worrying about the metrics, rhymes or rhythm. The focus is the message.