When you're poor and you live in an area completely unserved by public transit and you lose your license because you can't afford to pay parking tickets, are you really going to stop driving and lose your job and become homeless?
We have statistics to show what unlicensed and uninsured driver crash and fatality rates are like and they're a lot higher than the rest of the cohort, but there's still a sizable part of the US population that does all of these things and still uses the same public road infrastructure as everyone else, often out of lack of alternatives.