Nothing at all! ...Do you not know how stealing works after all?

[The apples fall to the ground as Gogol drops them abruptly. As he incredulously stage whispers the follow up question he leans back and away from Goro with a hand placed against his mouth.]

The reason for it is...! Any guesses? Well, it's because a complacent person might think, "oh, I'm so relieved that we've been saved by our generous neighbours!" and because it is the morally right thing we are told from a young age any further attempts to steal should be forfeit.