Two years ago, I wrote an essay on that question, but was too chicken to share it at the time.
Since I've shared a slightly revised version of it on Twitter now, I might as well do the same thing on here.
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The Man Who Says He Doesn't Care About People
Is BBC's Sherlock Really a Sociopath?
It is probably fair to say that to most people who watch BBC's Sherlock for the first time, the way the series' protagonist, Sherlock Holmes himself, behaves seems a little strange, irrespective of whether they are already familiar with the character or not. Sherlock comes across as extremely cold and uncaring – so much so, in fact, that John