How is that not relevant? I used craigslist to sell a car recently and with strangers showing up asking for solo test drives, the least I could do was ask for a valid license so I could make a copy and a cell phone number, which I verified on the spot. That or no solo test drive. True in extreme cases this would not have stopped my car getting stolen, but I cannot imagine leaving a house full of personal documents and valuables to a stranger whose sex and last name I did not even know. You can tell a lot from meeting someone in person, at least enough to raise red flags or some doubt and maybe have a neighbor check in from time to time.I think airbnb and the internet in general lull some otherwise smart, educated people into a false sense of security they wouldn't have offline but people need to use just as much commonsense online as they would in the real world.