Question about mafia films

[Gibbs]

Before I go into an in depth answer, can you name a few of your favourite movies, or films that really appeal to you?

The Godfather 1&2 and Goodfellas are excellent films and excellent mafia films- but believe me, there's plenty of shitty mafia films out there.
The director of The Godfather 1&2, Francis Ford Coppola, and the director of Goodfellas, Martin Scorsese, are two of the best directors in the history of hollywood, which is another reason those three films are so excellent.

I'm not gonna answer that question, because I like very different movies and I would need to take some time off to see what connects them.
But I don't get one thing:
I don't understand how organised crime can appeal so much to the people, when the movie literally shows how shitty this life is..I mean, are the few cool lines such as "I'm going to make him an offer he can't refuse" (or smth) , are they worth the future that always hits the guys who say these lines in the films?
I mean..look how Goodfellas ended..was all that being "cool" really worth that shit that came up later?
OK, u watch the beginning of the movie, and see how cool everything is, BUT how can it still appeal to you after you see how shitty it is in the end?

Ok, well, all this is about is really the point of perspective, which makes creating of this topic pretty pointless