Athenians are actually more alike than they appear. Both the Athenians and Spartans claim to value logical judgement above all else, but Alcibiades is able to win their support with an illogical argument.
Earlier in the text Archidamus, a Spartan, explains that the Spartan’s slowness in decision making is due to their “clear-headed self-control” (27.84). However, they do not exhibit this quality when Alcibiades easily manipulates them into trusting him. He begins his argument by asserting that others have done “worse things” in the past than deserting their country in a time of need. However, instead of actually citing what instances he is referring to, he compensates for his lack of evidence by telling his audience that he was a better “[leader] of the city as a whole” (127). Alcibiades is manipulating his “evidence” into seeming more substantial than it truly is by telling the audience that these “others… have incited the mob to worse things” (127). However, he is actually using persuasive rhetoric to shift the blame off of himself and onto a made up third party. This tactic is effective on the Spartans because Alcibiades creates a scapegoat that both lessens the impact of Alcibiades’ betrayal and makes him seem like a better leader than he was. Essentially Alcibiades is taking his illogical argument and reforming it as something that is not only perceived as logical, but also as a reason that his betrayal was necessary. Similarly Pericles praises the Athenians as being “[people] who think through what they will take in hand, and discuss it thoroughly” (42.40). However, after having heard Alcibiades speech “they were far more earnestly bent on the expedition than they had been before” (120.19). Contrary to Pericles’ belief, the Athenians’ were unable take a step back and truly analyze Alcibiades’ speech. This means that his speech was so persuasive to these lovers of sophistry that they didn't give a second thought to opposing it. Alcibiades begins his speech, once again, with an appeal to his audience’s logos.
He asserts that he has a “better claim than anyone else to have this command” because he has “won glory [and]… helped [his] country” through his “elegant appearance at the Olympic Games” (117.16). Alcibiades has the audacity to claim that he is worthy to command a military expedition because he was rich enough to afford seven chariots and win a race in the Olympics. He justifies his claim by stating that his actions not only earn him honor but “they earn a reputation for power as well,” he is translating his accomplishments into the qualities of a leader in a way that appears logically sound (117.16). Even though any intelligent Athenian should be able to see past his rhetoric for the illogical argument it is, no one does this because Alcibiades is so effective at how he presents his arguments. Alcibiades’ appeal to logos in both of his speeches implies that he is aware of the Spartans and Athenians’ shared value of logical judgement and, by extension, their similarities in basic human instinct.