I assume that you know about the facts that some humans have fewer than two arms, and some humans have not just fewer than five, but also sometimes more than five fingers [0]. In what way, then, do you hope to show that the facile versions aren't wrong? I think that what you're saying is that it is quite common for human genetics to plan for people to have two arms and five fingers. But it's not universal. We must distinguish between the two, because every time we make a universal claim about humans, we implicitly exclude the humans who aren't covered by the claim. Indeed, intersex folk, polydactyls, amputees, and folks with Down syndrome are all marginalized in our society, and all via this same mechanism of minimization and normalization.
On personal attacks: I've only lost karma in this thread and I'm going to continue losing it; I'm not sure by what means you could imagine that I'm effectively winning.