That sunk cost isn't as big as it would be if we actually administered it. There are lots of things we don't have to pay for - shipping, storing, and physically

That sunk cost isn't as big as it would be if we actually administered it. There are lots of things we don't have to pay for - shipping, storing, and physically administering it. not to mention that if it doesn't work, some people will act as if it is - further spreading the risk of getting disease. And on top of it all, anyone against vaccines has a real world example to draw dire things from (and lie about, obviously, but still). Simply having a sunk cost isn't a good enough reason to actually administer it.