黑布林英语阅读 初二年级第一辑——Jack and the Westbourne Fair

Summary...
Jack wants to go to the Westbourne Fair but he has a trouble on his school. He paints on the kitchen wall, he draws cartoon of Moby Dick...... So his parent don't let him go to the fair. Jack runs away from his home because he really wants to join in the fair. But he finds he don't have money so he cannot play anything. And he finds a missing-notice on the wall and the boy on the miss-notice like him so Jack thinks his parent are finding him. He runs away from the notice and he even finds the real missing boy so he takes him to police. The next day, classmates call him a hero.
Question...
1.Why do his classmates call him a hero?
Answer: Because he saves a missing boy and helps him to find the police.
2.Why does Jack's mother angry with him?