Certainly, I agree: there is no reason that we shouldn't be able to know every detail about the materials and processes that go into our food, but surely you acknowledge the connotative difference between:
"Scan this to see all relevant information"
and
"Governmental authority mandates that we declare this food to contain GMO"
There are issues with compliance costs that make it hard to force disclosure of all information. The compliance costs fo writing GMO wheat instead of wheat on a ingridient box are little.
I would be happy if the companies would have a choice to put up a scan code that provides all relevant information in exchange for not having to write things on the label.
Basically: How does one pursue the truth when direct engagement with evidence is infeasible?
I came to this question while discussing GMO labeling. In this case I am obviously not in a position to experiment for myself, but furthermore: I do not have the time to build up the bank of background understanding to engage vigorously with the study results themselves. I can look at them with a decent secondary education's understanding of experimental method, genetics, and biology, but that is the extent of it.
In this situation I usually find myself reduced to weighing the proclamations of authorities: