It's all about "principles", ultimately ....
I think, really, this boils down to another debate over the age old issue of how to handle cases where stolen property is unknowingly purchased by an individual.
As far as I'm aware, the laws basically state that regardless of one's knowledge or intentions when purchasing a product from someone else? If it was originally stolen and they manage to track it down, the current owner is required to surrender it without any financial compensation.
I remember many years ago, I worked for a small computer store. Not long after the Xmas holidays, a guy came in asking if we were interested in buying a Toshiba laptop from him. It was clearly in like-new condition, and he had the original box, manuals, etc. He claimed he got it as a Christmas gift but it wasn't exactly what he wanted, and he needed the cash for other things. The store owner accepted his asking price and bought it, so he could put it on his shelf and resell it for a $200 or so profit.
Unfortunately, several days later, the county sheriff showed up looking for it, and upon verifying it had a specific serial number they were after, walked out the door with it. Apparently, it was actually stolen from a local Best Buy store as part of an identity theft scheme where this guy, shortly out of prison, was applying for credit and buying everything from computers to new furniture, to resell to people.
The store owner was never compensated for the money he lost, buying the machine -- and I think all of us who worked there felt that was unfair. Apparently, the "law" says the procedure to deal with this is to file a civil lawsuit against the party who sold you the stolen property. Realistically, that's a joke since #1, you're not too likely to be repaid by a career criminal/con artist even if a judgement is awarded in your favor, and #2, you're still out valuable time and potential legal expenses to deal with it.
Bottom line? If you're the original owner of the property that was stolen, the whole process seems completely fair "on principle" to you. You're able to recover what was stolen from you. If, however, you're an unfortunate person on the other end -- who just tried to do an honest business transaction to buy a used good? It seems VERY unjust "on principle", that someone can just take away what you paid for and it's YOUR problem to chase down financial compensation for it.