Except that unlicensed driver OFTEN runs concurrently with the uninsured driver...and those are drivers we cannot afford to have on the road in their crapboxes that are also likely not registered and inspected.
Don't forget DWI. It's part of the combination - uninsured, unlicensed, and drunk. As someone who handled tons of auto cases in Austin, I can assure you that these three characteristics frequently go together.