I reckon the glyphosate isn't the worst chemical in the mix, but it's a carcinogen, and it's most of the volume of the mix. Roundup has dioxin in it, a byproduct of manufacture of the active ingredient. No amount of dioxin is safe.

The point is not so much a battle of toxicity between carcinogens, but the ubiquity of the chemical pollution of our food. Eskimos didn't get exposed to it by spraying their lawns. They got it from their food, which they bought off the shelves, just like the rest of us.