Nah, sounds like Steven Moffat pinched an idea from Red Dwarf. You know, the Inquisitor? Only instead of judging if people are worthy of existence by making them justify their existence to themselves, well, it must do the judgement itself.
I've lived for over 2000 years, and not all of them were good ones. I've made many mistakes. And it's about time I did something about that.
-The Twelfth Doctor, Doctor Who: Deep Breath