This is to be expected when largely uneducated men set themselves up as masters of others' faith and dictate what their followers must believe. That much power over others inevitably leads to abuse of that trust and arbitrary, whimsical dictates just because it is so easy to impose them.
Even if the leaders are honest and sincere (which is not a foregone conclusion), their arbitrary interpretations of obscure passages can have devastating, life-long effects on those who blindly accept them as "Gospel" regardless of the consequences. Some of these teachings are ridiculous on their face, showing sublime ignorance of real world facts. Having untrained self-appointed theologians make medical decisions for others is dangerous in the extreme.
Some examples:
The long-standing prohibition of blood transfusions is based on the false concept that it is the same as "eating" blood. This is entirely incorrect. It is true that one can be fed intravenously, but not using blood itself. Blood transfusions are to replace bodily fluids that are necessary for many different reasons. But the blood itself does not function as a nutrient.
Human organ transplants were prohibited for a number of years because they were viewed as cannabalism. Thankfully, this indefensible rule has been dropped, but it still shows how a few men can deny many people the benefits of life-saving modern medicine on the flimsiest of reasonings.
For a while, the Society insisted that Bible texts mentioning the heart were referring to the literal heart. Hence the ban on heart transplants. There were articles with anecdotal accounts of "personality transfers" and the like. One district assembly even tried to drive this home with a big heart that lit up to show that one decision or another was actually being made by the heart and not the mind.
I could go on and on, but you get my drift. Varying explanations of who comprises the "faithful and discreet slave" and the newest, most ridiculous "overlapping generation" tripe are but two more examples.