Doctor: Just touch these two strands together and the Daleks are finished… Have I that right?

Sarah Jane: To destroy the Daleks? You can’t doubt it!

Doctor: But I do… You see, some things could be better with the Daleks. Many future worlds will become allies just because of their fear of the Daleks. 

Sarah Jane: It isn’t like that! 

Doctor: But the final responsibility is mine, and mine alone…

And people wonder why the Doctor is fucked up.

He was right there, and he didn’t do it.  And then the Daleks and the Time Lords nearly blew up the universe.