Ten years or so ago, it was becoming the new thing to spread "Biosolids" (human dung) on the fields - now that was REALLY rank and horrible.
Even pigs know not to sh!t in the same place they eat - they always use a corner of their pen or lot, they don't spread it on their food. BUT because it was free, we seem to think it's a good idea.
But I haven't seen it done at all in the last three years or so, despite it being touted as the Next Great Green Thing. So maybe it turned out that the pigs were right, and people finally realized it .... !