<span>Superstitious people might do many odd things because they believe in luck, or bad luck. So, they may retrace their steps if a black cat crosses their path, they may not want to walk under a ladder because it is sad to bring bad luck, they may be scared when their mirror cracks because it is believed to bring 7 years of bad luck. They may do many things to get out of a possible bad situation, or induce a good thing to happen to them.</span>
Although we as the readers see how furious and proud of their beliefs both factions are, we see that they are arguing over something that is the same thing. Similar to arguing whether zebras are white with black stripes or black with white stripes.
Answer: “For I say in sooth, thou son of Ecglaf,, , never had Grendel these grim deeds wrought,, , monster dire, on thy master dear,, , in Heorot such havoc, if heart of thine, , were as battle-bold as thy boast is loud!”
Explanation: He is basically saying that Unferth boasts about his strength but doesn't actually have the skills to match it and that he's exaggerating.
True because ignoring relevant background issues will make your writing less persuasive.