Naturalistic fallacy

Naturalistic fallacy is when someone takes something that is natural and thinks it means that it is good or should be done without thinking about whether it is right or wrong. For example, if something has always been done in a certain way, like how people use to think it was ok to have slaves because that was how things were done a long time ago, naturalistic fallacy would be thinking it's still ok because it was how things were done in the past.