Problem: An apologia is a written defense of someone's thinking, speech or actions. It is typically written when something needs to be defended, e.g. when it appears that someone has said or done something morally wrong or socially unacceptable. No doubt, these things apply to Grendel, who has terrorized Heorot for a long time, murdering many innocent people. If there's a list of individuals who need an apologia to explain their actions, Grendel may be at the top of it.