I have tried to find out what is bad about seed oils. All I found was that they are extracted by use of solvents. Do you happen to know if the ones that are expeller extracted are also unhealthy?
Seed oils were introduced in the beginning of the 20th century which were primarily used for lubricating the industrial revolution until Proctor & Gamble developed a process to hydrogenate cottonseed oil, creating a solid fat that could be used as a cooking ingredient and was marketed as a healthier alternative to lard and butter. It was called "crisco" and as we know introduced trans fats into the food supply, which eventually has been banned in pretty much every Country and what trans fats do is promote inflammation and also some other nasty DNA
Seed oils contribute to all of the non communicable diseases that almost all Americans have at least one of, or more, most have more, a lot more and what seed oils do is they contribute quite a bit to chronic inflammation in the body and it's chronic inflammation that is the proxy for diabetes, insulin resistance, obesity especially with visceral fat, which is metabolically active and not in a good way, which eventually allows for fatty liver also PCOS, heart disease and stroke, the many neurodegenerative diseases like dementia, Alzheimer's and Parkinson's, rheumatoid arthritis, some cancers like breast and colorectal, COPD a chronic respiratory disease and a 4.5 trillion health bill every year.
Anyway, the hexane gas part of extracting seed oils is not really that bad, it really doesn't translate into anything derogatory health wise. It has to do with the polyunsaturated oil content in seed oils, which are extremely fragile to the balance between our omega 6's and omega 3's.
I can go into more detail of you want, but if people want to use a refined oil I would suggest a fruit oil instead, like olive oil or avocado and coconut, these have much less of those very fragile poly fats and of course butter and lard have almost no poly fats, which is what I consume along with olive oil.