Why do we need cars?

I have always wondered why do we need cars, are they really that important. Some people use a car to drive to somewhere far so they don't have to walk. I use my car when I go to work or when I need to go into Kentucky to the store and then to go home but that is the only time. Somepeople use their car like crazy and they want to drive everywhere they go even down the street they don't want to walk because they think that it is to far to go. People like that I think they are lazy because it it just down the street it wouldn't hurt them to walk and loose a couple of pounds now and then. I am not trying to be mean but our generation in the world today is the biggest and one of the heaviest generation because most of the people are overweight and they don't know how to loose. With the whole car situation we just need to give cars a break and use our feet God gave them to us for a reason and that reason is to walk. So we need to use God's gift that he gave us.