well regarding the trust in the government and hiding secrets from the genaral public: take the russwell ( or whatever you spell it) case: did u really need a general paranoia around that the aliens are invading us ? do u want the military secrets out so the enemy knows what to expect ? i think most time in a war the element of surprise is the difference between winning or losing the war. you don't want your enemy to find out your secrets, so he starts developing the same technology as you. Yeah i know it's all a matter of politics and some of the things are better left unknown to the general public.
and i think hollywood just likes to feed peoples fears. The change in the end with the man made viruses i think has something to do with the somewhat recent cases of anthrax and biologycal weapons in Iraq.
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