Missed calls, bad calls, calls we disagree with, calls we don't understand. These seem to happen in almost every game played at almost every level of football. When they happen at youth games, however, our reactions (parents, coaches, and players) need to be both tempered and appropriate. Complaining to, yelling and screaming at the officials doesn't fit into either of these categories.
While we all feel the need to express our feelings to the "offending" official, doing this serves absolutely no good purpose and can bring about more than a couple negative results, one of the worst being setting a bad example for all the players, cheerleaders, and other children who are everywhere at these games.
The officials do the best job that they can, but will inevitably make a mistake or two during the course of a game. They are as human as the rest of us. They try to see everything, but obviously this is not really possible. When they miss something, try to remember this and react in a way that is appropriate to both the situation and the level of play.
Let's keep this about teaching the kids football, teamwork, and good sportsmanship. That way everyone is a winner!