There are many opinions of course, I think they mostly are "in the weeds". Human societies share certain standards, as do groups of other social animals. If we didn't, we wouldn't survive very well. A single human "in the wild" is not very likely to succeed, while a human group is likely. we collaborate, we don't kill each other in our own group (usually), we have sympathy for those less fortunately.
One paleontologist says she realized humans were civilized when we encountered a human fossil with a clear bone break that had knitted.