We can actually here that the most likely reason that made the Hitler Youth to let Josef go in Refugee is in order to warn him not to try what he did again.
Inference is known to be the conclusion that one gets to after evaluating and observing the available facts and evidences provided.
We see that in Refugee by Alan Gratz, the Hitler Youth boy drags down the train. When this was happening, Josef thought he will be handed over to the Nazi police. But the boy takes him back to his own car instructs to wear the armband and never to do such again.
The Hitler Youth was actually known to be the youth organisation of the Nazi Party in Germany.
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