Instead of Wenger defending his players all the time, regardless of what they do, perhaps he should remove the captaincy from Gallas, and give it to Touré, who is by far a more reserved & laid back character?
Gallas has thrown the toys out the pram twice this season now, his form has been chronic over the last month, and you do not need one of your older & more experienced players to be such a petulant brat. You never see any of that from Touré, who has been at Arsenal the longest.
Imagine how the Arsenal players feel? They've seen the bone hanging out of one of their best mates leg, watched an injury time equaliser go against them, and then the man they look up to loses the plot? Bat day allround. Give the armband to Touré. It would be the making of him (as son as he gets fit too!).