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This angered the other pupils, who filed a petition calling for the thief's removal, saying that otherwise they would all leave.
When Bankei read the petition, he summoned them all. "You are sensible brothers," he said. "You know what is good and what is not. You may go and study elsewhere, if it pleases you, but but poor brother does not even know right from wrong.

Who will teach him if I don't? I will keep him here even if you all have to leave."
A flood of tears flooded the face of the brother who had stolen. All desire to steal had disappeared in him.

I don't believe in Santa Claus. Neither do I believe in converting somebody to leave wrong behavior behind with that method.
The thief would more likely see this as a license to continue the evil (while showing false tears and promising betterment)