[shintakezou]

What if it gives the survivors the strength to resist or fight back something else? If we think about it, human (and not human) very ancient history must be full of these interactions, and our evolution is a consequence also of this kind of thing. Only recently we know how to "protect" ourselves. But if we are in the what-if domain... what if letting it go make us a biologically better being? What if it by chance will give us the protection against some kind of tumor? What if its overall effect, not counting the deaths, is positive and not negative like making us infertile? What if.... We can't know. But we'll see one side of the coin when we'll have defeated this threat. (Which is not an existential threat, anyway, i.e. it won't make us go extinct)