Some of their most ruthless killers have become turncoats like Giuseppe Setola and Domenico Bidognetti. Ofcourse they say they were acting on orders from the bosses, but to make a deal with such people is pretty bizar.
The Italian State made a deal with Buscetta that was a killer and an international drug trafficker but with the collaborators of justice is very hard to weak a well structured clan like the Casalesi clan.It's a necessary evil.