Which might be a central purpose of a satire? evoking laughter by ridicule exposing moral excesses through the use of humor bringing about behavioral changes among the audience pointing out that social constraints are unavoidable

One central purpose of a satire would be "evoking laughter by ridicule" since this is the most common form, but it should be noted that this often has moral implications as well. 

It ends with the word losers because they are all losers in the end even if somebody wins. What was lost was the desire to win because everybody swam and some people thought that they are the best are they just can't do it. So mainly, nobody had the wit to think that the could do more than just win.