I am fully aware that this is not a new question, or a unique insight,

However I want a real answer from someone.

How is that McNabb can hit Armstron in stride 55 yards away yet finds it all but impossible to throw any pass shorter than 5 metres without endangering the local worm population.

It is just perplexing to me. 

Is it a mental thing, just lazyness? but that makes little sense because after the repeated criticism and no doubt personal frustration caused by all the short pass failures you would think he would concentrate more on them passes.

Is it technical, does he do something wrong with his front foot or his follow through, and if so, why has this not been fixed?

The part I dont get is why on earth does he not just aim above the receiver, if he is aiming for the chest and consistently hits the toes, and he never ever throws high, why doesnt he just aim higher and let the natural lower trajectory carry it to the chest.

An example, in golf I have a tendency to hit the ball with a late fade to the left (I'm left handed) its not a full on slice, just the ball will travel straight for the majority of its journey and then bend about 10-20 yards left over the downward part of its arc.  So I always aim down the Right side of the Fairway to compensate for this,  Why does McNabb not employ some similar compensatory change to his action on short passes.