People, from evolution, do whatever gets their genes as common as possible, regardless of what is good or bad. But, people naturally will love and care for their family since they have the similar genes as themselves. People usually don't harm others because of fear of getting punished. Essentially, most people don't have any real morals, they just do whatever it takes to survive, which often means caring about others.
I would consider myself a realist. I hope nopony is bothered by the vagueness of this post, I just don't feel like writing out all of my thoughts.