How does the authors statement on p. 6 that Theres far too much unnecessary killing nowadays... preview the events in the The Knights Tale?

Violence is presented within the context of the chivalric code. The Knight's Tale adheres to traditional values of chivalric, knightly honor in which there are strict codes of behavior which one must follow. This code of chivalry is not necessarily polite and decent, and Chaucer is always keen to draw attention to how unheroic such behavior seems. Within the morality of the tale, for example, Theseus' sudden decision to ransack Thebes to right a wrong is perfectly acceptable as punishment for a transgression against the honor of the dead soldiers; modern and medieval readers alike might feel somewhat differently. Finding them fighting, Theseus condemns condemns Arcite's and Palamon's actions not because they were fighting, but because they did not do so under the proper rules of a duel. One interpretation of the tale might therefore see Chaucer as almost parodying – showing the ridiculousness of – such masculine, chivalric codes.