How did valentine change enders mind about his military service?

Valentine, Ender's older sister, influenced his perspective on military service by appealing to his empathy and moral values. She highlighted the potential consequences of his actions, framing the war not just as a game, but as a matter of real lives and ethical responsibility. Through her letters and conversations, she encouraged him to think critically about the nature of leadership and the implications of his role in the conflict, leading him to question the justness of the military's strategies. Ultimately, her insights helped Ender grApple with the emotional weight of his decisions and the human cost of war.