>It shouldn't. Truth can't be found by forcing others to believe in your version of it. The acceptance of any given fact will naturally follow a normal distribution, and those on one side or the other of that curve aren't defective. They're actually necessary for intelligent and critical discourse.

I'm rather partial to imposing a tax on self-delusion and refusing to update beliefs in face of overwhelming evidence.

Also, the normal distribution part is plainly unjustified. The scientific consensus on various climate change topics is widely accepted to a high confidence by many, and widely denied with even higher confidence by many others. Bayesian belief networks are better models for individuals, and if we were to put belief in a given generic climate-change-related claim on a curve with 1:1 confidence in the middle and "certain true/false" at the extremes, you'd have a valley, not a normal. An asymmetrical valley, to boot.