RCSaunders wrote: ↑Mon May 04, 2020 6:05 pm
Immanuel Can wrote: ↑Mon May 04, 2020 5:05 pm
Why are there no books of, "apologetics," defending the truth of Chemistry, or Mechanics, or Astronomy?
Because they deal with different kinds of explanation.
Textbooks on such matters generally do not draw metaphysical conclusions.
Evidence based knowledge does not have to be defended by endless mental gymnastics, just clear reason.
But what's "evidence," RC?
Does it mean just things you can see, touch, taste, smell, put in a beaker, roll down an inclined plane, mix in a test tube, put under a microscope, and so on? If it does, then the only "evidence" for anything is physical evidence. Rational arguments then can't be included; for ironically, rationality is an operation that does not depend for its outputs on any specific kind of physical content to the exclusion of another. It's a handle-that-fits-various-pots, and is employed just as well in purely mathematical abstractions as with anything concrete.
But without rational arguments, how does the scientist know what his experiment is "telling" him?

He can't decide, if he really thinks rationality is unreal, because rationality is one of those non-physical realities he's at pains to deny exist at all, so he cannot trust it. He would then do experiments for no particular reason, and with no identifiable results...since the mechanism he needs in order to do his science (reason) happens also to fall into the category of things he claims he doesn't believe in.
You can see the inherent illogic of that, I'm sure.
But what about our present topic, morality? We can't put it in a beaker, or heat it up with a bunsen burner, or squeeze it in Vernier callipers...so does that mean it doesn't have any reality at all, since it isn't "evidence based" in the expected way? If so, we can all be amoral, at the very least. We may even become, without rational censure, what's conventionally called "immoral" -- though that category of description will have ceased to have any meaning for us.
I see you use, "metaphysical," as H.L. Mencken understood it:
Not at all. I use it very broadly. For example, I would say that moral ideas are metaphysical. So are abstractions and concepts. Mathematical operations surely are. So are valuations, intentions, relationships, purposes and meanings. So is the human mind -- though not the physical brain, which is not itself the mind.
You get the idea: anything not-physical-but-still-real, in other words.
What we accept as evidence will pre-determine what we will be able to see. If a person considers only the deliverances of his senses to be "real," then he will continually fight against his creeping intuition that he is not being honest with himself...and, of course, he will continually live in a contradiction: believing, for example, that the mind he uses to doubt is not real, but the brain in his skull, which of itself is only meat, is.