What’s the objective of youth basketball leagues?

On the Forum, there is a discussion of 1st and 2nd grade basketball leagues. Personally, I find no reason for 1st and 2nd graders to play organized basketball and suggest martial arts, gymnastics, swimming and/or soccer as sports which provide a better initial sporting experience.

However, if one runs a league for 1st and 2nd graders or puts his son or daughter into such a league, what’s the objective? Why play? […]