That can be a dangerous attitude about anything. Just because you don't understand a thing or the reason for it doesn't make it automatically bad... (For that matter, just because you do understand a thing doesn't make it automatically good: see "organic.")
Most things in life are complicated and nuanced.
And don't get me wrong. Some mass produced stuff *does* use bad ingredients. Especially if one has a disorder/disease or allergy to whatever it uses, which happens all too often.
But in the end it's just too nuanced to just look at a list and say "nope" on principle alone.