Knowing things is not the same as understanding them. Comprehension is not the same thing as analysis. Expertise is not a parlor game played with factoids.
But science is a process, not a conclusion. Science subjects itself to constant testing by a set of careful rules under which theories can only be displaced by better theories.
An uninformed judgement, even when right, is often less useful than a reasoned view, even when wrong, that can then be dissected, examined, and corrected.
