Experts often qualify their answers and a certain segment of the population sees this as weak. It makes sense if you consider the strength of your faith being an asset you would view any nuance as weakness.
This is the issue. Experts effectively speak in another language than the rest of us, and the dummies/(honestly mostly) intentionally disengenuous among us use that to disqualify experts.
Experts know there's a margin of error. Dummies are easily convinced by the intentionally disengenuous that the margin of error accounted for means it's all bullshit.