You have to live with it and learn to protect yourself from it. On an island as small as AC, the common thief is the 4th cousin from the lady that is the aunt of the sister-in-law of so and so. The island is so small, that everyone is related to everyone else. And you are not going to throw a relative off of the island.

But what I can say is that AC is by far the safest place I've ever been in the world. And I say that mainly because the good people that live on the island, do try and restrict the activities of the crooked. They know their livlihoods depend on tourism.