Individualism versus Groups
I think one of the main themes of this show is the difficulty of overcoming one's sense of individuality to form a group. Libano is visionary in his understanding that the union of the two gangs will yield greater results for them all in the long term. But the group's cohesion is constantly under peril from each member who has his own schemes to make money or their own ways of doing things. I think they all understand the benefits of being in the group, but at the same time they can't give up their individuality for its sake, and that's why their entreprise is doomed to failure. This becomes more and more obvious in season 2: without Libano's domineering personality, the members start running parallel schemes, stealing from the group and making secret deals with other groups. In season 2, the only one who still seems to care about the group if Freddo, but he lacks Libano's strength; all the others are just interested in their own lives, especially Dandi, who manages to rise above the group and become a powerful businessman in his own right.
Ironically, in spite of Libano's stress on partnership, it was his strong personality that kept the group together. But it was also his stubborn way of doing things his own way that caused the first attrition between the members.
This world is a comedy to those that think, a tragedy to those that feel.