Do atheists even need an objective moral system?

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Objectively actions will either cause harm to others or they won't. There are grey areas that are subject to debate and opinion and at times human culture. And that's really all morality is there doesn't really need to be anything funny going on. Some atheists will come up with some kind of evolutionary or physiological basis for it but I think that's going a bit too far, any intelligent being can be altruistic because they simply decided to be nice there won't be any other underlying cause making them do it.