There's a trope / common pattern / cautionary tale, of people claiming rationality as their motivation for taking actions that either ended badly in general, or ended badly for the particular people who got steamrollered into agreeing with the 'rational' option.
People don't like being fooled, and learn safeguards against situations they remember as 'risky' even when they can't prove that this time there is a tiger in the bush. These safeguards protect them against insurance salesmen who 'prove' using numbers that the person needs to buy a particular policy.
I was reading reviews of HPMOR on Goodreads and I noticed that the people who didn't like the book were essentially "put off by the rationality". They thought Harry was arrogant and condescending.
Then I was thinking, a lot of people are "put off by rationality" for similar reasons. What a shame. There's a lot of value in spreading rationality, and this seems to be a big obstacle in doing so.
Any thoughts on how to make people less "put off by rationality"? I think the core issues are: