A) he uses irony because it is not actually virtuous or excellent to kill
Explanation:
Irony is a rhetorical tool wherein what seems to be the case is really extraordinarily special from fact. In this example, it seems as if the author is praising slaughter and killing. He claims that these movements are "virtuous" and "great." However, the irony is that these acts are in reality a ways from virtuous or remarkable.
