Suspicion, fear, and hate - personified in the elderly rabbit Uncle Ananias, and led by him when Georgie was injured and taken into the House - lead to the ravaging of the House's garden and grounds by his family and their friends.
Uncle Ananias, a figure embodying negative emotions like suspicion, fear, and hate, leads his family and friends in destroying the House's garden and grounds due to Georgie's injury and subsequent confinement within the house.