The JWs attract people who don't have fully developed reasoning skills. Or they prevent people who grow up in it from developing them.
That's why nonsense of this kind is also prevalent among the membership. Various multi level marketing scams made their way through my congregation. Herbs and "holistic medicine" is also big.
Many years ago I went with my mother to consult with a Witness who was married to an elder in a neighboring KH. She sold herbs of various kinds. She had my mother hold a bottle of herbs straight out, locking her elbow. She would then literally say out loud "Does she need 1 pill an hour?" and would push down on my mother's arm. She kept repeating that and adding one to the number of pills until she felt resistance. Supposedly this was the body telling her how high the dosage should be. It wasn't much different than going to see a witch doctor.
And all of this seemed normal to my mother. Hell, it seemed normal to me until I became a teenager and started being able to think for myself a bit.