I definitely mean that unsaturated fats are to be avoided. Saturated fats are quite safe, however large single sitting intakes are a bad idea because of increased endotoxin absorption. Monounsaturated fats are probably fine, but other unsaturated fats accumulate in tissues over time and cause disease. DHA is implicated in alzheimers. PUFAs, including omega-3, are tied to cancer and metabolic disorders. Even the so-called essential fatty acids are understood to interfere with the endocrine system over time.
Coconut oil and dairy fat are safe. Other fats should really be minimized. To the extent that any fatty acids are "essential" you'll easily get them incidentally from foods. All vegetable oils are bad for you and fish oils are bad for you.
Ah ok wow, my mistake. It's so common to hear people confidently (and wrongly) saying that saturated fats are DEFINITIVELY SCIENTIFICALLY PROVEN to be bad for you that I just assumed that you mistyped.
That being said, from what I can tell, unsaturated fats are a far cry from your claim of "clearly bad", and even farther from "the only thing in a diet that's clearly bad". From a quick Google search, it appears that there's preliminary evidence that high amounts of PUFAs increase the rate of metastasis in rats with cancer, and preliminary evidence that high amounts of PUFAs decreases the "all-cause mortality" rate and rate of cancer events in humans with cancer. With such a low bar for "clearly bad", one could dig up a thousand and one studies about refined carbs (let alone sugar) that make it infinitely more "clearly bad".
*I mean that in the sense of reading up on things from reliable sources (studies etc), not that I'm a researcher
Coconut oil and dairy fat are safe. Other fats should really be minimized. To the extent that any fatty acids are "essential" you'll easily get them incidentally from foods. All vegetable oils are bad for you and fish oils are bad for you.