Tell it to the OP.
If you removed all the rules, people would just make new ones.
Which goes even further to put the lie to the idea that humans are inherently good. If goodness were inherent, we wouldn’t have such huge cultural/personal disparities in what we consider to be good. It would be largely the same. It’s like asking if humans are inherently right-handed. While there is a minority that is left handed, the vast majority are right handed, and these numbers remain true across all population groups. Right hand dominance is far more “inherent” than any sort of relative morality.
Like a few other posters, I believe that humans are inherently selfish. We are, however, social animals, and we rather quickly learn that personal advancement often relies on the health and happiness of others. We first realize this with parents: if mommy is happy, she plays with us more and gives us more attention, which we like. Therefore, we figure out that making mommy happy will make us happier. From there, being “good” is just a matter of how far you can extend that sense of inclusion: siblings, more distant relatives, friends, neighbors, countrymen. A few can take it all the way up to “species.” But it all boils down to learning one basic concept: if everyone else is happy, then I’m much more likely to be happy, too.