The comment you originally replied to said this:
> Weird how this is said without a shred of sympathy or concern for an intelligent, helpless creature
To which you replied:
> It's not weird at all. Biologically speaking, we are designed to eat meat. > The weird thing is how we developed sympathy and concern for such things.
What I was responding to was the claim that because we evolved the capacity to eat meat, we should naturally be dispassionate to the killing of animals. What I'm saying is that since we evolved both the capacity for carnivory and sympathy, that our capacity for eating animals does not make our sympathy for animals at all unnatural.
It's not unnatural for us to want to kill animals for our survival. But it's also not unnatural for us to care about and feel sympathy towards animals. I feel that you've been using our capacity for meat-eating to deem vegetarianism, sympathy towards animals, etc. as against our nature.
With that, the point of my differentiating between the act of hunting and eating animals versus experimenting with them and their dead bodies is comparable to the difference in severity of humans fighting each other versus torturing each other. Humans clearly have the capacity for both, and yet one typically elicits a higher negative reaction in people than the other. Our ability to empathize with all sorts of pain falls along such an axis.
Edit:
To your last point, if people naturally develop an empathy towards animals so strong that it overrides their own sense of self-preservation, why is that unnatural? Is a human giving their life to save other humans unnatural? That's exactly why I keep repeating that there is no "design" - or if you'd prefer, "intent". There is no rule in nature that says species are supposed to prioritize the survival of their own, and so deviating from that nonexistent rule is not unnatural. If experimenting on animals is absolutely necessary to humanity's survival and humanity one day refuses, it will simply die out like millions of species before it. Going extinct isn't unnatural either.