I would say isolation because Elie and his father are separated from his mother and 2 sisters so that he and his father go to the forced labour camp and his mother and sisters go to the gas chambers though the mother and one sister survive he does not see them again, at least not there. And seeing his father become helpless so that he must become his father's caregiver makes him resentful and then ashamed of his resentment.
The description of the Cyclops based on the description shows him to be a savage. The description states that the Cyclops is "without a law to bless them". He also says that the Cyclops do not tend to their crops, have no community, and abuse their wife and children. This disgust in the Cyclops ways shows that the values of Odysseus and the ancient Greeks are quiet the opposite of how the Cyclops live. The Greeks, and Odysseus, value hard work as well as justice and community.