What are the reasons some people feel certain books should be banned?

Liza wants to go see her old friends. true false

Asap that time of year thou mayst in me behold when yellow leaves, or none, or few do hang upon those boughs which shake against the cold, bare ruined choirs, where late the sweet birds sang. in this excerpt, what is the best meaning for the word "late"? not on time until recently dead well into the evening

What symbolic aspect did brother vu and mother leave behind? book = inside out and back again