Remember that the corruption index is just about how much corruption people "think" there is. And italians are pessimists, so you get this idea.
In sweden or germany they're just as corrupt, but also believe to belong to a superior race, so keep repeating to themselves that these things only happen to those people with dark skin, not to them!
Plenty of corruption around me in sweden goes completely unpunished. They just pin it all on the low level guy (who's often an immigrant) and never involve any higher up (who's often not an immigrant).