Nonsense. There's such a thing as people on the margin. On any binary issue most pieces of evidence "won't matter" to most people, in that that one piece of evidence is unlikely to be the one that "flips" the person, but that doesn't mean people are ignoring the evidence - it's just that most of the time any given piece of evidence is the difference between 99% believing and 98% believing rather than the difference between 50% believing and 49% believing.