Referencing the toxicity of water is a bit disingenuous, since the average human body is 60% water or more to begin with. Glyphosate, on the other hand, is a substance wholly artificial and foreign to the human body. Its only logical that if the substance is capable of interfering with a plant's enzyme pathway, said molecule can also have a similar role in animal hosts as well.

Surely each of us is carrying more than trace amounts of this substance, unfortunately. Its used in grain crops as a pre-harvest crop desiccant, although in a way to limit residue effects. The fact that France has banned the herbicide, with other European countries considering similar bans, is something I found interesting.