Right vs Wrong

Doing the right thing seems like an easy thing right? Well for some people it is definitely not a priority for them. I just don't see how people can do wrong towards others and feel good about themselves, or sleep at night. How can knowing you are causing someone major stress and anxiety make you feel okay about yourself? I would feel horrible because I am a good person. Some people just need to grow up. Realize that there are other people in this world besides yourself.