I’m assuming this is in the context of WWII? How is it propaganda? This sounds like a decent assignment not to try to morally justify the dropping of atomic bombs, but to build (and possibly dismiss) the arguments use for doing so. It can be a long walk, but there were massive geopolitical implication for both for and against at the time. Again, it isn’t a moral argument but an education that there are, for better or worse, people in the world that held both views.