Because a) Vinny had a terrible habit of adopting strays. He's goodhearted like that (it also shows that there's more to him than just being a gangster).

And b) Which is the really important part, and the nearly impossible part for the fanboys to grasp (and I certainly don't mean you, Malandrino). The mob is a fucking shell of its former self.

They've stabilized a little bit these past ten years. But when Cicale got his button? They'd make anyone with one functioning kidney and a hundred dollar bill in his pocket.