Ethics are defined by personal intersection of values. Ethics of American and Greek will be different. Ethics of Christian and atheist will be different. Ethic

Ethics are defined by personal intersection of values. Ethics of American and Greek will be different. Ethics of Christian and atheist will be different. Ethics of libertarian and conservative will be different. But then, what about libertarian atheist American for example? There might be thousands of axes, prioritized and changing during one’s life. How could any group create a shared ethics except a few obvious exceptions (theft, rape...)?