Mainly cause the damage has already been done, and the guys that were ratted out are dead, in prison, or getting released at an old age. Leonetti is hiding cause Scarfo has not forgotten about him, true Nicky is not as powerful as he once was, but Phil has to worry about the Narducci brothers and a few others, who spent a lot of time behind bars. It is pretty much you hit this guy and the cops and feds are going to be all over you, which is bad for business.