Ashley R. answered 09/24/20
Experienced tutor specializing in Writing and Proofreading
I agree with Marie. We first must consider not only when would murder ever be considered justified, but also the well known phrase, "Let the punishment fit the crime." Montressor notes that he endured "the thousand injuries of Fortunato...but when he ventured upon insult", he had enough. Poe never fully explains what those injuries or insults are; does the punishment of murder fit the crime of insulting someone?
Also, Montressor himself wants us to feel as if he is justified in his action. He says that we, the reader, "so well know the nature of [his] soul." If we see things from his point of view from the beginning of the story and take his side, as it were, we may feel that Fortunato got what he deserved. Montressor's own family motto states, "Nemo me impune lacessit"; no one will attack him without punishment. From his perspective, he was following the family view that when offended, you seek revenge. His family crest also shows "a huge human foot d'or, in a field azure; the foot crushes a serpent rampant whose fangs are imbedded in the heel." Again, Poe does not explain if the serpent's bite is enough to kill the human; the serpent, however, is killed by the crushing blow delivered by the foot. For Montressor, he is only living up to his family's standards.
We, however, get to decide if we agree with those standards or not.