The point is that the law is that stolen property can be clawed back.
A large % of BTC is stolen. You are probably holding some stolen BTC now. The longer that BTC trades, the higher the percentage of theft.
In the fiat economy only cash would
not be able to be accounted for in the same way as you describe above re.theft/BTC. That is, only cash transactions are anonymous.
Cash only represents around 3% of the money in circulation in the economy.
The question then becomes - is BTC more prone to theft than say theft via credit cards (for eg) ? Is this what you are saying ? I can't myself see why BTC would necessarily be more prone to theft.