I don't know much about what is ethics at all. It seems something that is too hard to be written in law book is termed as ethics. Or something that is duty but couldn't thought of as showering benefit in apparent exchange at person to person basis. I may have wrongly learned it as form of Virtue from Kant or what impression I have got from. But why virtue etc. Basically all social norms are protection from death or fear of death. As a society human may save themselves from other things but they may kill each other. Ethics may be just a passive way to save oneself from death or perceived threat of death or perceived fear of death of society at larger scale. If this is just connected to death or negative form of life then it is worst than anything else as it will cause more fear of death. etc.