I was just thinking that this experience of yours is a kind of mirror image to how PPs of PCs often seem to view us as parents with- difficult children. I've had friends and neighbors, even cops, somewhat taken aback when we've said things like "she's not welcome here" or "I'm not going to help her out" or "I wish you'd keep her in lockup a little longer".
Our two PCs were/are sometimes more easy child than "normal" just because they saw how difficult child's shenanigans affected wife and I -- the worry, the sleepless nights and middle-of-the-night calls; and they knew things from school about the kids she hung out with that we didn't, other than PCs occasionally saying something about so-and-so has a bad reputation without any specifics. They could probably have gotten away with more than they did.
You mentioned easy child's less-than-stellar driving skills. Boy I know what you mean! Aside from everything else, difficult child is the worst driver ever, even when clean and sober. Always fiddling with the radio, rummaging for something in her purse, lighting a cigarette or eating or opening a pop can or applying makeup (or all the above at once), and just generally paying no attention to the road and traffic. She has a lead foot and oversteers (a recipe for rollovers), watches directly in front instead of aiming high, habitually drives in the passing lane, never checks her mirrors and gauges, and suddenly jumps lanes without checking her blind spots. I'm glad she has no license now. She could get one -- the year's suspension is up -- but she has no car and she can't drive ours so she hasn't bothered to renew. When riding with me she makes little comments from time to time about my driving -- sheesh! If only she had the remotest hint of a clue... Riding with her is absolutely terrifying. Chicago is just that little bit safer since her license was revoked.