Let me rephrase it, I am sure it is within your grasp. An analogy, to be valid, has to abide by elementary rhetorical rules. The introduction of a false equivalence, such as a parallel drawn between a biological element required for survival and a medical intervention, invalidates the intended point. There are limits to reductio ad absurdum: if the logical thought process of the opposing party is purposely warped, that is a straw man fallacy and nothing else.
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