There are almost no just-plain-true (or false) facts in the macroscopic natural world. We’ve engineered our environment to support deductive reasoning, which doesn’t work in nature. Text from Elijah Millgram’s _Hard Truths_pic.twitter.com/e6HLMSjpb3
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HIV is defined as “whatever vaguely-related viruses cause AIDS” and AIDS is defined as “whatever diseases are caused by HIV.” And no one has any workable story about what “causes” means, in general.
I agree philosophers have rightfully debated causality. But for AIDS and especially HIV, I'd wager that's not the definition, but at best "how we get to a definition".
Well… having looked into the matter in some detail, I think that as a matter of science, you are mistaken. HIV is polyphyletic; the only criterion for inclusion in the taxon is that it infects humans (not other primates).
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