“Justin McNaull grew up in a hurry. By the time he was 23, McNaull had graduated from college, married and gone to work for his local police force in Virginia. But McNaull, now 36, still bristles at the memory of something he wasn't allowed to do at 23: go down to the airport counter and rent a car. "I'd been involved in police pursuits at more than 100 mph," he says, "and yet they still wouldn't rent me a car."

To many young people, rental-car restrictions are more than an annoyance. They're also a confusing contradiction, in terms of what society expects of them. After all, states trust people to drive at a much younger age: Most states issue driver's licenses to persons as young as 16 years old. Yet nearly a decade must pass before the same persons can earn the trust of Hertz or Avis.”
What’s the purpose of these two paragraphs?
And a one sentence summary.