Hypothetical, is it possible to retrieve stolen blockchain currency?

Hypothetical, is it possible to retrieve stolen blockchain currency?

It is my understanding that blockchain technology is decentralized meaning there is no middle man in transactions. This seems like it has benefits but it also has downsides. When necessary, middlemen are able to retrieve objects under their control and redistribute. But with blockchain, if a private key is stolen (this will inevitably happen a lot; probably due to social engineering) and funds are transferred, how can they be recovered? Other than getting the culprit to hand over their private key of course. Is there any "police" mechanism within the blockchain technology?

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