Raghuveer Parthasarathy at The Eighteenth Elephant:
Insulin is an abomination. Sure, injecting it saves the lives of millions of diabetics, but that injected protein is unnatural and abhorrent, the product of a genetically modified organism! And it’s not even necessary: Rather than playing God to coax single-celled creatures never designed for insulin production to make the stuff, we could be harvesting it naturally, like we used to just a few decades ago. After all, one need only slaughter about 20,000 pigs or cows to provide a pound of insulin!
If this argument strikes you as absurd or even horrific, it should.
More here.