Marianna: The problem of drunk driving has been somewhat ameliorated by public education and stricter laws  Additional measures are nevertheless needed  People still drive after drinking, and when they do the probability is greatly increased that they will cause an accident involving death or serious injury  David: I think you exaggerate the dangers of driving while drunk
Actually, a driver who is in an automobile accident is slightly less likely to be seriously injured if drunk than if sober
He argues against a point that is not one that Marianna was making.