Which moral theory confuses what people should do with what they actually do?

The moral theory that often confuses what people should do with what they actually do is descriptive ethics, which describes and analyzes people's moral beliefs and behaviors without prescribing what they ought to do. This approach tends to blur the lines between moral norms and actual practices, leading to the assumption that because certain actions are prevalent, they are morally acceptable. This confusion can hinder the development of normative ethical frameworks that guide moral action based on principles rather than mere observations.