Have to say Corsica is an extremely beautiful place however and as with all ethnic groups the criminals are a minority. It's safe for tourists and the Corsican people themselves are very hospitable. They're a proud people though, they've historically resented being a part of France and don't like to be called "French" neither do they like being called "Italian". Ethnically they're most likely a mix between Sardinians and Northern Italians (Tuscans for that matter).