Doesn't sociopathy merely imply a lack of caring, not an active malevolence? Because Sherlock does repeatedly demonstrate an extreme lack of caring- the accused murderer at the start of 'The Great Game' who he refused to help while mocking his poor grammar; his (inaccurate) revelation that Molly's 'boyfriend' 'Jim' was gay; his entire relationship with Molly; the way he left Adler at the end of 'A Scandal in Belgravia'; his poisoning and terrifying Watson in 'The Hounds of Baskerville'; the way he keeps disrupting Watson's attempts to live his life; etc.