Geshmakenstein asked why a guy has to walk a girl to the door if you wouldn’t do that for anyone else.
This is a valid point. Indeed, you can assure the gir’s safety by making sure she gets into her house as we all do for just about anyone else we drive home.
The answer, however, is becasue we submit to a differnt standard of “mentschlachkeit” when we date. There are numerous little things we do (or don’t do) once we are married that we would not have done when we were dating, or we wouldn’t have gotten a second date.
No need to worry. Once they are married, I assure you he will drop off his wife and simply watch her go into the house from the car.