Makes me wonder if either ...
A) .. those supposedly harmful effects of seed oils apply to ALL sorts of these oils and ALL ways of processing and consuming them ..
.. or ..
B) .. some oils and/or ways of consuming them are perfectly healthy.
(And they're only harmful because most people are systematically shooting themselves in some other way.)
The mechanism that UFA/PUFA are less stable and thus deteriorate from exposure to UV sounds pretty plausible.
But our bodies have marvellous mechanisms of self repair.
Maybe under certain conditions, let's say, for example, enough sleeping hours, which contribute to high melatonin, which is a powerful antioxidant, the seed oils are not harmful ..?