If at 9:50am on release morning, aliens threatened to blow up the
world if we shipped, we'd certainly do something about it.
But it would be insane to expect us to *document* that we'd do
something about it.
IMHO it's perfectly reasonable for documented policy to simply say
"bugs after this point won't stop a release" because there are
rational people behind the process to handle exceptional cases, and no
amount of imagined example scenarios make the policy any less
appropriate.