People love witch hunting. The marketing trend profits off that greatly, in fact. How often are big-box food distributors blamed for being "all artificial" which is synonymous with "bad for you?" I just saw a cheese-it commercial touting how they use REAL cheese, instead of artificial cheese. Does anybody know how we make cheese? It's already a damn process for christ's sake!
There are things that are bad for us (transfats), and then there are ghosts (this wasn't grown organically, it contains boogeymen chemicals!)... same goes with the sensitivities. It's all part of our anti-rational history!