Actually, for a team that does not concede many goals in the WC...a few of their tormentors play or played in Italy. These are some of the Italian-based players who have scored on Italy in the WC since 1982...(I did not include any who may have scored in the PK shootouts that Italy have been involved in).
Falcao (Roma) - 1982
Maradona (Napoli), Platini (Juventus) - 1986
Canniggia (Atalanta) 1990
Milan Rapaic and Ahn Jung-Hwan (Perugia) 2002
Worse yet...Platini is of Italian origin (his grandfather moved to France in search of work), and many others like Socrates, Salas and Passarella were bought by Italian clubs after scoring on them in the WC. The treatment of Ahn was an anomoly...the president of Perugia at that time was a crazy fascist idiot. Most famous though, is Juve buyingTrexeguet after he poisoned them in Euro 2000