I think the three separate detectives - plus the not inconsiderable Watson - went out of their way to make sure the Luccas made out okay.
In fact, I think the Lucca's actions were in reality, much more legally dubious. Watson's account of the face off in the dark room, with the signalling three times with that clumsy device to tell Mrs Lucca what she already knew, Lucca's vanishing rather than telling her what had happened, strikes me as pretty fictitious. As Watson hadn't much experience of writing fiction, he laid things on too thick.
It's possible that the Luccas were actually doing something about Gorgiano, other than lurking in various lodgings and deserted houses. That would pall quickly. They could have lured Gorgiano to where they killed him.
Of your last paragraph; I always rather thought Holmes, and perhaps Watson, found music steadying after violence.
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In fact, I think the Lucca's actions were in reality, much more legally dubious. Watson's account of the face off in the dark room, with the signalling three times with that clumsy device to tell Mrs Lucca what she already knew, Lucca's vanishing rather than telling her what had happened, strikes me as pretty fictitious. As Watson hadn't much experience of writing fiction, he laid things on too thick.
It's possible that the Luccas were actually doing something about Gorgiano, other than lurking in various lodgings and deserted houses. That would pall quickly. They could have lured Gorgiano to where they killed him.
Of your last paragraph; I always rather thought Holmes, and perhaps Watson, found music steadying after violence.
edit: sorry about the editing