So, each idiot that blackmails us, threatening with bacteria and the rest, should be rewarded?I'm not sure who is supposed to have suggested that. I do feel confident that if (perish the thought) a rogue nation ever did initiate bacteriological warfare, nuking them to glass will not end the threat. Threatening to nuke them to glass probably increases the ranks of those willing to break glass vials in public places.
FWIW, if you want to attack a particular country, you don't even need to cross their borders. Infecting a transatlantic aircraft with a contagious disease with a 24-hour incubation period would spread the contagion into airports, hotels, offices and entertainment complexes before anybody starts getting sick.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
