Why didn't Grant want to go with Vivian to Baton Rogue that night?

Grant didn't want to go with Vivian to Baton Rouge that night because he felt a deep sense of responsibility toward his students, particularly the young man on death row. He was also grappling with his own feelings of hopelessness and frustration regarding the systemic injustices they faced. Additionally, he was unsure about the impact of such a trip on his emotional state and the effectiveness of his role as an educator in their lives.