They're sending a message against lawmakers. They're planning on making new laws against mafia networks: more years in prison, confiscating their houses and money and giving it to the community. In the last few years, because of that many criminals have "betrayed" their mafia families, giving names to the cops, so that they'll get less years in prison. Many women, wives and daughters of godfathers, have been killed because they talked with the police, they denounce the crimes committed by their relatives.

They use bombings to send a simple message: nobody messes with us, we own the place.