Oh, good point. I think of "come up with theory, think about what it implies, look for evidence one way or the other" as the ideal, but the difficulty is that confirming information is more salient in my memory than disconfirming.

On the other hand, filtered evidence is still evidence, and a lack of outside evidence can be a sign that there's no good confirming evidence. (Or, in this case, just a sign that the poster is new around here.)