* Mental Instability: The community believes Boo is mentally unstable, possibly due to a misunderstanding of his actions. This belief might have led to his parents keeping him confined for his own safety and the safety of others.
* A Possible Crime: There's a rumor that Boo stabbed his father with scissors. While this is never confirmed, it could have been a catalyst for keeping him isolated.
* A Desire for Privacy: Boo might have chosen to isolate himself. He seemed to prefer solitude and didn't want to engage with the world. This is supported by his quiet, secretive nature and his interest in watching the children from a distance.
* Societal Prejudice: The town of Maycomb is deeply rooted in prejudice and racial discrimination. Boo's isolation might be a reflection of the town's fear of the unknown and its tendency to ostracize individuals deemed different.
It's important to remember that Boo Radley's story is a complex one. His isolation likely stemmed from a combination of factors, including his mental state, a possible crime, his desire for privacy, and the prejudices of the community.
The novel encourages readers to think critically about the way society treats its outliers and the impact of societal pressures on individuals.