Here's why:
* The Pigeon Contest: Palmer is forced to participate in a cruel pigeon contest at school. The pigeons are trapped in a small box and made to fight for a limited amount of food. This experience traumatizes Palmer and makes him feel deeply sorry for the pigeons.
* Mr. and Mrs. Periwinkle: Palmer becomes fascinated by two pigeons who live in the old Periwinkle house. However, he observes that they are constantly fighting over food and space. This reinforces his belief that pigeons are selfish and aggressive.
* The "Wringer": Palmer, in a desperate attempt to help the pigeons, tries to "wring their necks" to put them out of their misery. While he doesn't actually go through with it, the act symbolizes the harsh reality of the pigeons' lives and the cruelty they face.
Therefore, Palmer learns that pigeons are victims of human cruelty and often live rough and competitive lives. He develops a sense of empathy and compassion for them, even while struggling with his own internal conflict.
It's important to remember that the pigeons in "Wringer" are not representative of all pigeons. The story uses them as a symbol to explore broader themes like cruelty, compassion, and the consequences of our actions.