I disagree with the idea of coaches not knowing the rules. The better coaches like the better officials know the rules. They are around the game everyday, they must "teach" the game and without knowing the rules how could they do this? Coaches attend rules meeting every year and it is funny how stupid rules like this years "player area"(I say stupid becuase only a few fields offer the proper space for this and even if they do it is not marked, and I have seen first hand bad officials try to enforce this one, another example of bad officiating) but anyway, its funny how the "new" rules are the ones officials harp on and forget the important ones, ie. proper throw ins, off sides(will always be a problem), handballs, dangerous play. Most of the time it is inconsistent.

So who do you consider knowledgeable sources? If an official was evaluated by both coaches in a game then bias would show. Consistent bad reports would show an official that has problems. Maybe random reports by the coaches and an unknown/unbiased official watching would be better.

Your explanation shows why there are so many problems, you think coaches dont know the game or the rules. We all accept bad calls like we do the bad passes, but we move on. It is the consistent bad call or no call that fuels the flames.