Boo Radley saved the children from Bob Ewell. Atticus thanks Boo because if Boo hadn't stepped in to stop Bob Ewell, the children probably would have been killed. Atticus is thanking Boo Radley for keeping his children alive.
At least, that's how I see it :)
Atticus found out about the children's game involving Boo Radley when Heck Tate mentioned it during Tom Robinson's trial. Tate revealed that he had asked Atticus not to tell the children about Mr. Radley's courage in saving them from Bob Ewell, as it might prompt them to reenact the story. This indicated to Atticus that the children had indeed been playing a game about Boo Radley.
Boo Radley saves Jem and Scout from Bob Ewell in To Kill a Mockingbird.
In chapter 8 Atticus learns about Jem and Scout communicating with Boo Radley through the knothole. Atticus tells the children not to tell anyone that they had seen and been in contact with boo.
Atticus thanks Boo for saving his children from Mr. Ewell.
Atticus tells his children to stop bothering Boo Radley because he wants them to respect his privacy and not perpetuate gossip and rumors about him. He believes in treating others with compassion and understanding, even those who may be misunderstood by society. Atticus wants to teach his children the importance of empathy and respecting others' boundaries.
why do you think jem confessed to atticus about the childrens activites regarding boo radley
Atticus Finch is thanking Arthur "Boo" Radley for saving the lives of his Children, James and Jean Louise. His children had been attacked by Bob Ewell , the father of a woman who claimed rape by a colored man, Tom Robinson. When actually her father Bob Ewell had beaten her because of her contact with Tom Robinson during an innocent interval at the Ewing home. Atticus Finch defended Tom Robinson against the charges of rape. The Finch children are waling home in the dark from a school event. Bob Ewell is following them. He attacks both children. Arthur Radley has been following and watching the children in secret as their protector and guardian. Arthur uses Bob Ewell's knife against him to protect the Finch children. He then carries the injured Jem back to the Finch home while Scout follows him.
He finds them playing "the Boo Radley game" and also trying to stick a note to the window of the Radley house.
I think that Jem confessed to Atticus about the children's wrong doing because when he found the blanket around Scout's shoulders it instantly hit him that it was Atticus. I feel that Jem thought that Atticus was going to complain to Mr. Radley aobut Boo. Jem felt scared for Boo because he didn't want Boo getting hurt. Jem then started blurting out confeessions about how Boo was innocent. how boo could have but didn't hurt them. Jem confessed because in the end he wanted to thank Boo for all he did for them.
When Boo Radley's father Atticus died, his older brother Nathan moved in to take over the household. Boo Radley is a mysterious character in the book.
Atticus tells the children to leave Boo Radley alone and stop playing the game because it's unfair to make a game out of someone else's life or personal circumstances. He wants them to show empathy and respect for Boo Radley's feelings and privacy, rather than treating him as a source of entertainment or curiosity.
Mr. Radley caught the children trying to get a note to Boo Radley.