To add just a little to the points Kaosium has already successfully established: Meredith's family and Amanda and Raffaele's families have completely different missions. The missions of Amanda and Raffaele's families do not involve Meredith; they involve injustices of the Italian law enforcement and judicial systems. Meredith is not to be forgotten, but the reality is, her death is a separate issue.
Ideally, the identities of Meredith's killer(s) should be a separate issue from the Kerchers' mission, too. Obviously, it is usually too tall an order to ask most families to disengage from the personal feelings they have toward those they believe harmed their family member. Ideally, though, the Kerchers should be relying on Italian law enforcement and the Italian justice system to take care of business for them in terms of crime and punishment, not getting some additional help for their case from the newspapers. Likewise, ILE should not have used the media to try its case before it got to court.
The defendants' families may rely on newspapers and other media to achieve their mission because they are not speaking out against anyone who is awaiting trial in the court system. Their criticism of the police and the prosecution is an entirely different phenomenon from the police and prosecution's criticism of the defendants; it is not tit for tat.
The problem with Maresca is that, as a plaintiff's attorney, he should not even be in the picture until after the defendants are finally and fully convicted. Only then does he have the grounds to sue specific persons for damages. Counting on a conviction for the defendants he intends to sue leads him and his clients to pursue a specific outcome (conviction), when they should be pursuing blind justice.