Why do some people think carseats are optional?

Why do SO many people think that car seats are not necessary? In my part of town it seems like almost NO ONE straps their child or children in as they should.  Yesterday I saw a woman with two car seats in the back of her car and there were children sitting in both of them. However, neither child was strapped in to the seats. At the red light they both stood up to lean into the front seat to talk to their mother, who was already on the phone.  Then today in a drive through I saw a woman vigorously cleaning her dashboard with a dust cloth and her Camry was in fact impeccably clean but her small son was standing in the backseat looking back at me and waving! I was not amused. She did in fact drive out of the drive thru with him still in the back window. These people are usually the ones on the news grieving the loss of their small child from being ejected from a car window during a car accident. This angers me to no end. Why not protect your child as best you can, people should not trust that their own driving will keep their child safe. Its other drivers that they need to be worrying about.