A lifetime driving ban is not overly harsh if the driver kills or severely mutilates another person. There are places they can live where a car is not required. It may not be(seem) easy but there is no reason to subject society in general to a proven risk, which is what someone who has failed to this degree is.

If they complain there is a simple & effective rebuttal; Tell it to a corpse, we don't want to hear it.