Except almost everything brought about by capitalism where cheapness and profit were the end goals never ended well. Seed oils are not food and the fact that more than 30% of the calories of the average American come from these processed oils does not bode well for the health of our nation.
They blatently are food, they are eaten and provide some nutrition. There's a decent amount of evidence they are not good food, however. If you actually stick to the facts and avoid inflammatory rhetorical flourishes you might get more traction.
Blaming a lack of food quality on capitalism is pretty rich. For a point of comparison, consider that even in socialist countries that didn't have famines, the availability and quality of food was orders of magnitude worse. The entire eastern block had basically no restrictions on pesticides, food poisoning was a regular occurence (due to broken refrigeration, lack of labs to test meat samples, fertilizing directly with fresh human and animal feces). That was if you were lucky enough to even get some of the items.
Hell, in the GDR there were persistent rumors that they kept using byproducts from coal refining to make margarine (a practice started by the Nazis) and I know for a fact that they used animal bile to replace hops in beer.
We don't even have to talk about pre-modern times where almost everyone had a diet severely lacking in variety and nutrients.
