They Can't Be Bothered
A couple of years ago I logged in to my credit card account to check the balance and pay it off for the month. Then I noticed it claimed over a thousand pounds of unposted transactions. After questioning my wife closely (she denied all knowledge), I called the card company who confirmed that someone had bought a bunch of airline tickets in Milan using my card. So the card was duly stopped, but the woman on the phone said they couldn't do anything about the transactions until they hit the system properly because it might not be a real one[*]. Here was me thinking it could be an ideal opportunity for a bit of cross-border cooperation to contact the supplying travel agent (who probably ended up footing the bill when the transaction bounced) and the local police, getting the details of who was flying and when, and possibly having a welcoming committee. But no, none of this was possible. In a later communication I did extract the information that someone had attempted to use the card the day after I'd had it cancelled, so I think I must have caught out the criminals by spotting it so quickly.
[*] when a company rings up for authorisation it reserves an amount of your available credit which either cancels when the transaction hits the system or times out a couple of weeks later if it doesn't - often this is when a card is used as a deposit for something settled in cash.