Even if working around butter flavoring has made a few factory employees sick, it’s absolutely silly for ordinary consumers to be afraid of their microwave popcorn. There’s a huge difference between 8-hours-per-day exposure over many years, and occasional exposure for 10 minutes during late-night TV time.
Gold miners use cyanide, a very serious poison, to isolate precious metal from ore. Should we be afraid to wear our wedding rings, too? Fear of food is a powerful societal neurosis. But if we absolutely must be nervous in the kitchen, perhaps we should identify a few things that might actually be harmful, like all that E. coli in spinach. Yuck.