Frankly every time a child gets in a car they are much more likely to get injured than in a game of rugby. I guess it's time to start wrapping our children in bubblewrap every time they go out, just in case...
2) Rugby is recreation. Riding in a car is a necessary part of daily life. Regardless of risk, one can be given up much more easily.
That's a very America-centric point of view, and completely not true if you live in a city designed to accommodate high-density living (or at the very least one without terrible public transport).
If you're putting a child in a car, it's safe to assume it's not usually for recreational purposes. It's usually because it's the easiest (or only) way to move them a certain distance.
Exercise is a necessary part of a healthy life. If Rugby motivates you to stay fit, then maybe it improves your chances of a healthy life
Yes, exercise is necessary, but rugby isn't the only way to exercise, nor is it nearly the safest.
Cars aren't the only way to travel in general, but, for many people in many situations, the other options aren't viable.