Generally vegetable oils are highly processed and go rancid very quickly, even before you buy them. This is because they are low in saturated fat. For example, coconut oil is high in saturated fat, which gives it a long shelf life and makes if good for cooking with. If one gets over the whole "saturated fat is bad for you" nonsense, then there is no problem.
Most people also don't realise that animal fats are not only saturated fat, but often contain large amounts of other fatty acids such as monounsaturated fatty acids, the same as what you find in olive oil. The fats in animal foods also contain the fat soluble vitamins (such as vitamin A, D, E, K), so removing the fat will have a negative impact on vitamin content of the food and so it's health benefits.
Also butter, coconut oil and macadamia oil for example is very low in Linoleic acid (an omega-6 fatty acid), which is very high in most vegetable oils. A high ratio of omega-6 to omega-3 fatty acids in the diet accentuates omega-3 fatty acid deficiency. This is a common problem in modern western diets that are high in vegetable oils now.
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