In cities or close by cities this is not a problem. I'm from norway, the country is big, but with few people. So the train or bus doesn't go where I need to go. Last week I was going to a place 25km away from my home. I was thinking of taking the bug but it would take 1h14m. with my car it is a little under 30minutes.
Then there taking stuff home. A few weeks ago I needed some planting soil for my garden. I only needed 3 bags with 40L of dirt. But imaging taking that on the train or the bus. People living a apartments in cities don't have this problem. But other people leed other lives.