If someone steal your wallet with your bitcoins inside, who is the authority that is going to act for that consideration? Actually, none because bitcoin is free of authority which is a good thing and bad thing also. For example, when Mt Gox. went to bankruptcy, no one took care of thousand of people which bitcoin was stolen (according to them) and the japanese governement, even that took actions against Karpeles and the company, wasn't enough to fulfill the situation.