What if you were hit by a car while walking to work? Wouldn't you want someone to come over, call and ambulance, and try to help you? I think most people would want that and that is why we should care what happens to others. If you don't care what happens to others, then why should anyone care what happens to you? Just think what a terrible world it would be if everyone just ignored what was going on around them. It would be a world I would not like to live in. We have to keep each other in check. Hence caring about others and hence laws that attempt to prevent harm to individuals. Including yourself. If no one cared enough to make laws, you would be in a much less safe environment. It is evolutionarily advantageous for people to care bc it helps our species survive.