Oils are popular topics. Some are loved, some despised. Some are healthy, some unhealthy, and some are in vogue like fine wines. Even though oil manufacturers rarely make bogus claims about their products there are many myths out there. It’s primarily because of the health food and healthcare industries. They have effectively created most of the oil and fat myths to the point where the myths are entrenched in food lore. The myths are used by marketers when they promote the supposedly “healthy” characteristics of their favorite oils. Of course the bogus claims are aimed at health-conscience consumers and that's why most discussions about oils are based on myths further cementing their acceptance.
A few generations back people knew very little about fat and ate a lot of it. They weren’t very particular about which fats either, yet they had fewer chronic diseases. Is there an association there for why there are more chronic ailments today?