That 99/100 believe one thing shouldn't be used silence the 1/100 - that is what I, as a layman perceive as going on in the scientific community.
An easy example of this is when climate scientists refuse to make their raw data available to those that wish to challenge their findings. If they have faith in their findings, what's the problem?
Other notable issues arise when things like the famous hockeystick graph which clearly showed temperatures rising in advance of rising CO2 levels is used to argue that rising CO2 levels are responsible for the temperature increases observed. Or when dire predictions are made (No polar ice by 2015!) and then the predictions fail to come true.
To the average person, being asked to accept and act based on scientific consensus these public mis-steps undermine their faith in science and those that claim to practice it.
I don't want to debate the above examples (but hey, it's Slashdot, go for it!), my point is the above are examples that have flown in the face of what everyone was taught in 8th grade science (mis-reading a graph, refusal to share data, and making outlandish predictions based on a desire to gain publicity rather than scientific facts).
The point is the perception science by the layman, and the above examples all undermine the perception of science's infallibility.