Why is the simplest and easiest way to do major damage to a country without using any military power if you are an enemy country?
Let us take the USA for instance.........how could an enemy country that hates everything we stand for do the most damage to us?
Yes a clandestine biological attack is one way, but lets assume its not as brazen as that, what is another way that is very sneaky and acually could begin with one person and spread like wildfire as more and more people become "infected" in an antiAmerican mindset where after a while we no longer recognize our own country?