Interesting that your list is entirely processed foods.

Probably best never to buy such products at all, and if you do, you probably aren't the sort that cares whether the fat is from butter or from canola.

But the products exist because people buy them as cheaper substitutes, reducing dairy demand.

Milk drinkers will just drink less when the price is higher (sometimes voluntarily, sometimes involuntarily).

Or do they buy them because they're convenient?

Or do they buy them because they're cheaper than restaurant or take-out alternatives?

Or do they buy them because the packaging is appealing?

Regardless, processed food is generally shit, everywhere. Discerning health and quality conscious consumers in any nation aren't likely to favour purchasing processed food.