You're overly cynical. Nobody in the United States worries about buying adulterated milk, or medications that are actually mixtures of flavored syrup and radium, or bread that uses sawdust as a cheap filler, because there's clear standards for what something labeled as "milk" or "bread" means and regulators with the power to enforce those standards.

Lots of other countries don't have those things, which is how things like this happen: https://en.wikipedia.org/wiki/2008_Chinese_milk_scandal