“Taxonomies are purely humanly contrived organizational constructs. They are not part of the scientific method, they are products arrived at by checking data against organizing principles derived from theory.”
I wouldn’t say purely. What we are doing is recognizing that certain things have essential characteristics such that if said trait were to be removed it would no longer be in that class of entity. We need categories before we have a method. So categories are important to the scientific method. Further, without essences, we have no categories. No categories means no science as we know it. Essentialism is essential.
About those principles. I see you neglected to comment on the non-demonstrability of the principle of non-contradiction. If you deny this principle you deny science, unless you want to say that genes are and are not responsible for, say, coding proteins simultaneusly, at the same time in the same way. Then science would not have happened. If you agree that the principle is true, you just gave into something that is non-physical, and not provable by science. Congratulations.
“Aristotelian essentialism is not part of the scientific method.” See above. By the way this is not an argument, you’ll need to try a little harder than this. Where are those premises, wheres logic 101?
“The first part of understanding comes with a ‘guess’ or ‘conjecture’, the leap of imagination – it’s not the origin of the guess that matters in the acquisition of ‘objective knowledge’ about the world but, rather, whether it’s testable.”
The first thing we know, via simple apprehension, is objective and that is “being” (esse). This is not something you can deny or be wrong about, and being per se is not testable. Modus ponens, the principle of non-contradiction, simplification, material implication…none of these are testable in a scientific paradigm and yet the scientific paradigm follows logic. If all things must be testable, then we would have never gotten to big SCIENCE. Science is based off of certain indemonstrable unprovable first principles…opps, there goes Aristotle again.
I will say that after this, yes there is a lot of guessing, and being wrong. But this does not mean we cannot come to know that morality is objective. Our epistemological capacity is beautiful, and powerful, you shouldn’t underestimate it.