like the first case of anthrax was an "isolated incident"!! when will our government learn that we are smarter than the average bear?
It's called "critical thinking" skills, which most intelligent people have acquired. And how about that saying: "trust, but verify." You can "trust" the government all you want, but a smart person verifies everything before believing (blindly). Any behavioral psychologist would say someone who insists they're right by repeating themselves weakens their credibility and becomes more suspect as to the voracity of what they are saying. The Bible even says: let your yes be yes and your no be no. (Don't go on defending, adding, etc., it takes away from the strength of conviction.)
And if there's no conviction, and not enough evidence to point to a simple yes or no, then, gee, isn't it okay to say: "I don't know yet, but I'm working real hard to find out the truth." Seems to me that is genuine, sincere, and most truthful (thereby leading to less suspicion and speculation by the listener).