The concept is that anything that happens to that aircraft (or car) is the sole responsibility of the pilot. Flying into restricted airspace? If it's necessary to avoid a collision, you do it. Putting the plane down in a field? Better than hoping you can make it to a runway when your engine is out and lives are on the line. Another driver signals that you are clear to make a left turn on a congested road? Nope, because when that traffic you couldn't see hits you on the right, you're responsible for your car, their car, and all the people inside both vehicles.