I understand your thought on this because it happens here too. However, the reason I would be sitting next to my car, 1: I want to keep the public from accidently damaging my car. Belt buckles, soft drinks spilling, kids on bicycles. ... etc.
2: I wanna talk to anyone interested in my car.
3: Sitting next to my car, is what I so when not working on it.
4: finally, when I showed my horses back in the day I never one time opened the arena door and just turned my horse loose. You show them. You take time making them what they are, you take time cleaning then up for the show and then you enjoy the outcome. By the way, lots of county music at horse shows.