I've changed my view on this subject. I used to think that those people are just stupid and ignorant about how to spend their food money, but now I think there's a bit more to it.
Yes, healthier food can be cheaper, but not initially. Like you actually have to spend a fair bit of money to get a decent pantry going to make a variety of meals. Recipes will say "make this for less than $5", ignoring the fact that you probably need to go out and spend $50 on pantry items to begin with. And yes, those items will last a long time, but I wonder if it's a bit high minded to think that kind of upfront cost is feasible for everyone.
Secondly, I learned about food deserts in America. Apparently you guys have entire neighbourhoods where the best vegetables you can get are half-rotting crap from a gas station that is priced ridiculously high. And taking a trip out to the nearest walmart or costco is again not feasible for everyone.
Salute. You've found the problem using research.
That's way more than the weeping shitposters ever tried. ---