I used to wonder about the same thing, but then I had a former FBI agent explain this to me. By the 1980s the five major New York City organized crime families had become largely benign from an outsiders' perspective, and had no interest in bringing this kind of attention to themselves.
This came up in the context of a conversation I had with him about just how dangerous it must have been to go and arrest someone like John Gotti.
"I think you've watched those Godfather movies too many times," he said, "Nobody in this agency goes and arrests someone like that anymore. We just call up his lawyer, and within an hour he and his lawyer are sitting in my office drinking coffee."
Yeah, it's "amazing that", with all of his armed security, working and living in secured buildings, and with the use of a 40,000 man armed-to-the-teeth police force, he wasn't "hit".
Meanwhile, this "elite" gun-grabber was making it more difficult for law-abing citizens to protect themselves with legally owned firearms.