While some may feel "secure" with a person driving them home who have consumed that amount of alcohol, IMO, most would (and should) not.

Keep in mind, thie situation in this case was not a "garden variety" drive home by a friend from a pub. The situation of "drive in question" is not remotely like what you suggest.

FYI, outside of denial, there is massive amounts of scientific data on the impacts of drinking and driving-some of those related to this situation are listed below:
""If you drink alcohol and drive, you are likely to find it difficult to:
• judge the speed of your vehicle;
• judge the distance between your car and other cars;
• notice traffic lights, vehicles and other hazards;
• concentrate on the task of driving;
• react appropriately to things going on around you, particularly if an unexpected hazard should suddenly appear.
Alcohol also gives you a false sense of confidence. You may take more
risks than you normally would – but remember, alcohol slows down your
reaction time to hazards: you may not even react at all.""