Right and wrong are learned/programmed behaviors, not inherent.
What does that mean?
It means that there is no inherent right or wrong, good or evil. They are all social constructs in order to control the masses and prevent chaos (some being for good reason and others not so much).
At the heart of it we are animals and without limiting factors/social constructs then we would act a whole lot different (take what you want, survival of the fittest, etc.).
Take for example if you grew up in an isolated community and your parents/everyone around you were nudists and never wore clothes. To you that would be entirely normal because you have been programmed to think that, just like we're programmed to think that wearing clothes is normal.