When the speaker uses pathos, they are engaging the feelings of their gathering of people. They are trusting that, through making the gathering of people feel profoundly about what they are talking about, at that point the crowd will agree with them on the current issue.
In Kennedy's discourse, he utilizes pathos when he discusses the numerous preliminaries that their generation has experienced.
This reflexive pronoun is the best fit because it needs to agree with the antecedent--in this case "scholars". Because scholars is plural, the pronoun also needs to be plural. Themselves is a plural reflexive pronoun, so it will properly complete the sentence.
