Yes, the rest of the team would have been let down, but that is what being part of a team is all about. You work for the good of everyone. You keep the rules, because you're part of a team.
Sport, at it's foundation, teaches character. Sometimes you win. Sometimes you lose. It's part of life.
This was a selfish, thoughtless, foolish act by kids, and the parents are supporting their children in their selfishness. Perhaps we shouldn't be surprised, by the responses of the parents, that the children flouted the rules. Perhaps this precedent had already been set at home.
It's elitist and it's arrogant.