GOD
The Doctor can see the devastation in her eyes as she stares over the rubble of what was once a city, what were once trees, what was once life. She doesn't look at him, and he knows why. He knows the question she's not asking.
Why couldn't you stop this, Doctor?
Both frustrating and warming, the faith these humans put in him. As if he can stop wars, hatred and nasty things forever with just a few witty remarks and a bag of jelly babies.
He can't, of course. And when they learn this, they always hate him for it.
Inspired by warinbabylon's excellent 'War'