Like vitamin C to fix everything that goes wrong on long sea voyages, or removing lead and mercury from diets, avoiding alcohol and thalidomide during pregnancy, abstaining from cigarettes, removing cocaine from Coca Cola, or any number of other additives that are perhaps less clear cut: https://time.com/7210717/food-additives-us-fda-banned-europe...

Avoiding poison is a "quick, easy fix" to the consequences of that poison (or the opposite in the case of vitamin deficiency). Whether there's any reason to believe seed oils are harmful, I have no clue, but the idea that we could be en-masse consuming something harmful has dozens of precedents.