It would make sense if public transport was much much better and cheaper.
We both work approximately 2-3 miles away from our house, in opposite directions.
I have to take 3 separate buses for 2 companies, so pay for 2 different tickets. And still walk approximately 10 minutes.
Versus, get in my car, drive for 7 minutes and park outside the door.
My missus has to either take 2 buses (same company though) and walk 5 minutes for a total journey time of 35 minutes (waiting for second bus), or take 1 bus and walk 10 minutes, for a total journey time of 30 minutes.
Versus, get in her car and drive for 5 minutes and park outside the door.
This doesn't even take into account the amount of times the buses might be slightly late, so if you rely on two+ buses, you might miss the second!
So, we could take public transport and pay more money, waste more time, and probably get wet, but instead we have 2 cars.
Edit: I should also note, we live approximately a 15 minute walk from a city centre, so it's not like we are out in the sticks.