Vietnamese would have to disagree. The smell smacks you in the face as soon as you step off the plane. Hey, ain't no Porta-Potties out in the paddies, just roll up the pant leg, squat down and let her rip......
I suppose their generations have built up some sort of immunity to whatever gets passed along.
Germany has been doing this for decades, if not centuries - growing food for human consumption using human waste-based fertilisers.
That said, if I did know it, I would not purchase / consume food grown in such media. The danger posed by medicine residues, etc. is very, very real.