Take a good look at your city's crime logs. At least in the US, it's not unusual for most DUIs to be repeat offenders; and again, not unusual for people to drive with revoked licenses. Revoking a license does nothing to protect society from those willing to flout the law.

If anything it makes it a lot worse, because now whatever car they're driving doesn't require them to breathe into it in order to start it, and now when they drive into your parked car (or worse) they have a huge incentive to commit a hit and run to avoid being caught driving with a suspended license.