The correct answer is - The groupthink of the football team made him uncomfortable, but he felt it was more important that there not be dissension before the homecoming game.
Even though the captain of the team knew it was wrong to steal the other team's mascot, he went with this idea anyway because he didn't want to create any disturbance in his own team. He knew that if he rejected their idea there might be problems and dissatisfaction in his team, and he couldn't afford that before the game.