I grew up in a small city in the US and was taught early on to never leave any property in view in your car. The US also has a worse issue than other parts of the world because people often leaves guns in their cars.
https://everytownresearch.org/report/gun-thefts-from-cars-th...
I can’t tell if you think people obviously do leave guns in their car, and GP should know better than add the phrase in, or, that nobody does, and GP should know better.
I can tell you have seen people do both in different parts of the country.