Choice

Within the Doctor's time stream, the "ghost" of the War Doctor told the Eleventh Doctor that he did what he did "without choice, in the name of peace and sanity." The Eleventh Doctor countered "but not in the name of the Doctor." (TV: The Name of the Doctor)

When presented with Mr Cleaver's findings concerning the planned Blaidd Drwg nuclear power station, "Margaret Blaine" conceded that it "seem[ed] [she] had no choice" but to stop the project, only to reveal herself as Blon Fel-Fotch Passameer-Day Slitheen and decapitate him shortly after. (TV: )

Behind the scenes
Reflecting on his participation in the Time War, the War Doctor mentioned that he never wanted to fight, but had no choice. (NOTVALID: He Who Fights With Monsters)