[angersock]

Gah, that's horrible. :(

Teaching people (especially in natural sciences!) to immediately disregard something, just to be safe, is not conducive to learning. Sure, at later levels, you can teach them the truth of things, but what if they don't get there?

Then you have a bunch of people freaking out over incomplete information that they learned in school, and influencing dumb policies (e.g., hooplah about nuclear plants).