> I also don't see why this is a question we ask the recipient. Wouldn't it make more sense to ask the payor?
Because at that moment that's the recipients money as far as the bank is concerned - it might have been a payment for some valuable item and the payment order used as proof of payment, it might have been a gift or anything, and the beneficiary is legally protected from the payer changing their mind after the fact, the bank isn't allowed to take their money without the beneficiary's consent just because the payer wants it. There are specific legal exemptions that may apply for cases where the payer didn't actually order that payment (e.g. some types of fraud, or technical faults such as a single order getting executed twice), but they don't apply here, because they did order that payment to that account, so it pushes this situation into the same box as all the other (quite frequent) issues of the payer changing their mind after the fact and wanting the money back.
If there's a dispute and the payer claims that the beneficiary shouldn't have that money and they owe it back - well, the banks don't get involved in disputes about who owes whom what, they can only execute payments when ordered by the owner of the money or a court order resolving that dispute. It's just as with a cash payment, if someone has gotten your pile of cash because there's been a misunderstanding, or mistake, or a change of mind, or even actual fraud - you can't simply take the cash away from them if they disagree or dispute the issue, they'll keep the cash until the dispute is resolved, or possibly the police will seize/freeze that cash following due legal process.
There are very many cases where there might be a dispute between a payer and the beneficiary, someone demanding their money back for all kinds of reasons - those cases far outnumber situations like this one. We have a process for resolving disputes about money, and that involves civil claims in court. After a correctly executed payment is completed (and a payment credited exactly as the payer ordered, even if they wanted to order differently or changed their mind) it can be reversed only if the beneficiary agrees or by a court order taking the money from the beneficiary and returning it to the payer, as in this case, that's the law.