A gangster's paradise is a successful life as a gangster. The successful gangster earns money doing gangster stuff. But the gangster is taking risks that might cause something very bad to happen to him someday like him getting shot by another gangster. It's similar to the way Walt/Heisenberg made millions of dollars in the show Breaking Bad, but very bad things happened to many of the people on the show.
A gangster's paradise is a successful life as a gangster. The successful gangster earns money doing gangster stuff. But the gangster is taking risks that might cause something very bad to happen to him someday like him getting shot by another gangster. It's similar to the way Walt/Heisenberg made millions of dollars in the show Breaking Bad, but very bad things happened to many of the people on the show.