Here's an example:
I have invented a food preservative that extends prepared food shelf life and keeps food prices down a little. It is finely atomized copper. It works great.
What's that you say? Copper is a metal that's cumulative in your body and causes health problems, so it shouldn't be used?
But it extends shelf life and food is cheaper, and government shouldn't regulate what we eat!
You wouldn't want to eat copper or any other poison in your food, right?
Same with trans fats. They can't be processed properly by the human body and are poisonous over time. And, they are man made and have no place as a food additive.