Sherlock Holmes becomes more human and more adept at fitting in with a lot of people, but he remains separate from the human race because he finds that a better place to observe that from. He stays on the mountain top because there, he can see clearly.
Steven MoffatHitler: Thank you, whoever you are. I think you just saved my life. The Doctor: Believe me... It was an accident.
Steven MoffatMadame Kovarian: The anger of a good man is not a problem. Good men have too many rules. The Doctor: Good men don't need rules. Today is not the day to find out why I have so many.
Steven Moffat