(I love both Rey and Luke in this scene, because yes Rey believes Ben (Kylo) can be saved but she's also not afraid to hear Luke's side of the story out. In Clone Wars tv show and in Tales of the Jedi there were Jedi there in the Jedi temple who could not get people to listen to them. Count Dooku being one of them, and Qui-Gon being another even though they sensed something bad coming. Even Ahsoka was hardly listened to by anybody but Padame and Anakin and Obi-Wan (yep his name is hyphenated.) This is what makes Rey so different from previous apprentices in training she's willing to listen and wait.
(This example Rey sets before us is actually the same thing Jesus asked of the crowd in the Cities he preached when he walked on this Earth one of his many advices is "Let them who have ears let them hear!)
Rey upholds that verse. "'Let them who have ears let them hear!" directly in front of Luke and because she does that for him. He ends up listening at least halfway to her. He pays her forward because of her respect of listening and because of that Ben (Kylo) is distracted long enough for Rey to rescue the others. And even those she's a good listener she still holds onto her values and hopes that someone so far gone as Ben could also be saved and that never wavers off her mind, precious Skylights. Pyrix_Fairy I think you might wanna know this about the sequel protagonist Rey in the sequel trilogy of Star Wars is an incredibly good listener a rare quality we have for women in major movie franchises including even Mothers' in movies. And I adore Rey for this acting and the meaningful conversation between her and Luke about the past. She listens, and learns a few things but she also keeps some of her most important values she had since before she even met Luke. That's an incredible female protagonist there.)