I asked Uncle AI, why Caroline, and he replied instantly:
it's a highly singable, upbeat song that encourages audience participation
I also wondered why Red Sox fans are so skeptical. He gave me a list (with bullets; of course, this is America):
Spending limits
Years of self-imposed spending limits have led to poor performance on the field and declining interest in the team.
Unfounded promises
Fans are skeptical of promises made by club officials, such as "full throttle".
Lack of investment
Fans feel that the team has not invested enough in the roster.
History
Some fans feel that the team, its fans, and the city have distorted or overlooked history, such as the Jackie Robinson tryout