Please explain why it makes “very little sense”. If someone is eating fish and veggies with some olive oil, nuts, green veggies, grass fed meat. How is that crazy or unhealthy? Yeah if people start eating bacon and cheese and sausage it will go downhill very quick, but it is completely nutritionally sound and has positive impacts on brain health, diabetes, cardiovascular risk just to name a few. For someone stating how knowledgeable you are, the way you are dismissing this is incredibly ignorant
Now, I am in no way an expert and what I am saying might just sound dumb, but I remember reading one time that humans were different than other 'carnivores' in that we need to cook our meat in order to avoid getting sick. Of course this doesn't happen every time, but the odds are much greater. The exception to this rule is fish.
So, yes, nuts, beans, olive oil, chia seeds, avocados, even fish are good examples of fatty foods that are healthy (in moderation). I am sure extremely lean and unprocessed meats are probably fine on occasion (not my thing), but that is generally not what we are talking about in the American diet. I think there is a slippery slope with the quality and quantity of meats people generally eat. Honestly, I think people would be surprised how little they miss steak if they just stopped eating it for a while. I am not sure how to get people off of the bacon craze, though - it's so trendy right now.