Rate the following argument fragment on its writing, argument, and language skills:
Evidence: Google's driverless cars "have driven more than half a million miles without a crash." This is an incredibly high mileage for never having a crash, and it shows that these cars are going to be incredibly safe when they are released to the public. Even thought the cars are still just being tested, they have never had a crash. Granted, the cars are not completely driverless, but the safety of the public is still the most important thing in the minds of many car manufacturing companies. These cars will prevent many people from being killed or injured in car accidents.

Score: 2