This is a great video produced by TheFA.com called Ray Calls for Respect which clearly and effectively illustrates just how ridiculous crazy youth parents can behave on the sidelines. Verbal attacks toward the referees and their own kids can be so damaging to the kids involved and the game as a whole. It is a powerful video that all parents regardless of the sport their kids play should watch.
The Main Point
According to the video, it is getting harder and harder to find people willing to referee. I can believe this because I would not want to subject myself to the barrage of insults and complaints from crazy youth sports parents. The video correctly states that there would be no games if there are no referees.
The other point that the video makes is that players improve by learning from their own mistakes. I have seen it in all sports where parents unrelentingly find faults with their kids performance and do not hesitate to make it public by yelling from the sidelines. Kids of parents like this eventually play tentatively. When this happens a kid starts thinking too much about what to do and not do that they do not react instinctively. A slight moment of hesitation can be the difference between success and failure. The best line in the video: How is your son suppose to learn if he's not allowed to make mistakes.