If they drive safer because they don’t want to scratch the paint on their car or because the feel some kind of communion with others, what difference does it make?
Maybe I didn't get my point across clearly. People may be worried about the paint on their cars, but that doesn't mean they are worried about the safety of others.
Of course, driving slower is still driving slower, to the benefit might still be there.
However...
If someone chooses to only drive "safely" because their car would get scratched, rather than drive safely because it could kill a child, that person should be taken off the road. It's unbelievable that drivers shouldn't be expected to drive with the safety of other human beings (and animals) in mind.