Nobody wants to hit somebody or be hit by a car. A race car with a full roll cage and the driver strapped in a 5 point harness, neck brace, etc. simply can't see everywhere all the time. People need to be careful, and drivers are people too.

Walking in the pits requires extra care. I think it is impolite for pedestrians to wander around like they are in California (not looking out). Don't go near a running car (they may back out). Don't go more than 5-10 mph in the pits either.