Why does the village chief make the boys sing and dance at the end of ch. 9? What is he gaining from this moment?

When Beah's rap music cassettes are found, he explains he used to dance with his brother and friends before the war. The chief orders Beah to dance and he is convinced that the boys are not rebels, but lost children fleeing the violent conflict. When asked whether the boys had been assisted or had stayed in the fisherman’s hut of their own accord, Beah tells the chief that the boys stayed there on their own to spare their caretaker from punishment. The chief releases them but orders them to leave the village and continue on their way.

What do you mean by what is he gaining at this moment?