Well it was established, in the departing episode for the Ponds, that the Doctor can't change events that he's aware of. He knows that Davos lives to make the Daleks, so really no matter what he can't kill Davos as a child. Sure the Doctor was trying to pull off a similar paradox way back in Genesis of the Daleks, but that was with the help of the Time Lords. The Time Lords can deal with paradoxes. The Doctor by himself cannot.So the Doctor has destroyed worlds. Caused Gallafray great turmoil and now.
He is responsible for Daleks.
Of course as I pointed out before, Moffat doesn't give a **** about even his own continuity, so... Meh.
Oh, and BTW, to be clear in Genesis of the Daleks the Doctor lets the defenseless Daleks live, after having been specifically sent to exterminate the threat. They even replayed the moment he spared them in this episode. So he was already "responsible" for all of it anyway.
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