You see another side of Draco when he's with his dad. When Draco is with his dad, he doesn't say anything. He keeps his mouth shut. He's sort of bullied by his dad, so he acts very different.
There are, of course, all sorts of other unpleasant regimes outside the walls as well - the military dictators of Latin America and the apartheid regime of South Africa.
As yet, the Negroes themselves do not fully appreciate these old slave songs.