Was Saha offside?

The first goal of the Arsenal - Everton game last night (video here, thanks to @arsenalist) was contentious to say the least. Seamus Coleman played the ball through towards Louis Saha who seemed to everyone in the stadium and all those watching at home to be at least 2-3 yards offside. The pass was partly blocked by Laurent Koscielny but the ball continued through to Saha who moved onto the ball and finished well. Koscielny played the ball deliberately but was not making a deliberate backpass, and so a new phase of play did not begin when his boot made contact with the ball.

Koscielny attempted to make the interception because he knew Saha was in behind and would be clean through on goal unless he blocked the pass. Saha's movement in the offside position violates Law 11 of the Laws of the Game (pp 31 and 100) as set down by FIFA as follows:
Saha was "gaining an advantage by being in that position" by "playing a ball that rebounds to him off an opponent having been in an offside position".

The incident was similar, if not identical, to example 12 on page 107 whereby a shot is deflected into the path of an attacker in an offside position.

In the end, Arsenal rallied and won the game and so the goal was not the main issue post-match (both Wenger and Moyes agreed that it was offside) but the decision was wrong and I can't see why match officials don't state publicly why they make the decisions they do. Surely people would be more ready to accept that officials will inevitably make mistakes, and to forgive them when that occurs, if they publicly explained or even apologised for what had happened on the pitch.