I mean, there was that time in 11's second-and-a-half series where he was about to shoot someone with a revolver and Amy stopped him. And then later just let Solomon the Dinosaur-napper explode in a doomed ship or something.

Not to mention murdering himself, Rory and Amy twice in a row on the hunch that it was all a dream, that anti-Silence lynch mob thing...

But hey, NuWho has been pretty universally dark. I still occasionally arrest people's thought process by pointing out that until we got to Moffat, every Xmas Special involved the Doctor being materially involved in a massacre.