Is There Something More Than Bloody Opinion?

Is there a set of ideas western civilization is predicated on that are more than just bloody opinion, that's the question. Cause you can produce an infinite number of groups of people with equally validly in some sense. You're never going to get equality of outcome across the infinite number of ways that you can parse up society into groups. It's not even technically possible, unless everyone has nothing. So anyways, these are obviously very powerful ideas, and the mere fact that they killed a hundred million people already, or more in the twentieth century, wasn't enough to put them to rest. Anyway. Is there something? This is the main question....