Should a politician suspected of a criminal offense resign ?
Well, “suspected” doesn’t mean “guilty”, of course. However, in a country where a criminal trial last years or even decades, waiting for the final verdict can just be too embarrassing.
There are further complications, of course. The convoluted Italian criminal law tends to criminalize everything, sometimes even irrelevant or purely formal infractions. Then there are the frequent acquittals due to the statute of limitations, and the incredibly complex and obscure cases that the Italian Authorities are often compelled to investigate, like for example the supposed negotiation between the Government and the Sicilian Mafia.
A possible compromise could be to wait until the formal indictment of the suspected, which in Italy must be issued by a judge after a hearing with the full participation of the defense.