as I recall -- during the first half of the first season, in one of the sessions with Dr Melfi, Tony stated quite angrily that while he adored having AJ look up to him, he didn't want AJ to turn out like him.
Remember when Tone gave that bit of foreshadowing during Christopher's intervention? "You killed little Cosette, I should suffocate you, you little prick!" A few seasons later, you see the camera pan to the empty baby seat in the wreckage of Chris' car before Tone decides he is too much of a hopeless liability to be left alive. TLDR: Chris was the "son he never had," but T seized the opportunity to put him down for the sake of the child. https://i.poastcdn.org/218aeea0c83deef231b0f35953cdeda38b42653d2c2759362ab12c688e5eb879.png https://i.poastcdn.org/0aa27cbfee9a919a3935d15d4ee8d1e69720b0a844dfb2e6857572c7323f329f.png
Tone also whacked the Nigger that mugged and raped his psychiatrist even though there was nothing for him to gain from it. A true Anti-Hero. https://i.poastcdn.org/dd3862fe8b1f8cc090873668fe8b01fdd923243d90372255319889481c8b8b55.png