People consume bad products because they are in bad circumstances. Maybe they are too stressed to cook and can't afford a healthier alternative, and then become addicted to the sugar content (McDonald's), maybe the company has a monopoly on something people need for work and school so people have to buy it (Comcast), or maybe human psychology makes us susceptible to certain kinds of deception (Fox News).

Claiming that a product can't be bad if people consume it is incredibly naive.