People make mistakes. Sure, some deserve to rot in prison for irredeemable crimes, but many (at least, in my context as an American citizen) are there for nonviolent drug offenses or failing to pay fines.
Further, the comparison was against convicts, who do it frequently and severely enough that someone finds it worth the money to prosecute and get a conviction. And at that point, yes, a correlation appears.
You're still making the same fallacy: "I can find an exception, so the correlation doesn't hold." That doesn't follow.
(And, FWIW, I don't drive to work.)
Additionally, despite the reasonable conclusion we can make that those in prison are less moral, it probably does no good for recidivism rates for us to talk about how immoral prisoners must be. It stigmatizes them, and puts more barriers on the path to recovery and reintegration into society.