There seems to be a lack of common sense going on here.
The FDA, and their equivalent in other countries, certainly do have problems with the criminal fraternity cooking up make believe drugs and selling them to the gullible.
In this case The farmer also lacked common sense, in not clearing with the authorities what he could, or cold not, make and sell. and how it should be described an labeled.
The fact that he was Amish is not relevant.
There are many perfectly fine herbal remedies sold through out the world, and provided they are labeled correctly, and contain no prohibited substances, no one cares.
In the past, some of these remedies have been found to be highly effective and have become the basis of modern medicines.
Perhaps his Chickweed mix was too effective, and had ruffled some Manufacturer's feathers, who in turn had complained to the FDA out of jealousy.