There are ways to minimize the risks (see another comment reply of mine in this thread). But yes -- carrying a bunch of cash with you and meeting a stranger in a parking lot, then getting in that person's car is definitely a $5 wrench attack vector.

Face-to-face OTC trades remain one of the riskiest things you can do as a Bitcoiner. Do not engage in trades in dark alleys or empty parking lots!

https://www.cbc.ca/news/canada/manitoba/bitcoin-robbery-winnipeg-1.6582916

https://twitter.com/lopp/status/1570369111842078720 [Nitter]