There's a final filter in rationality where you take your ideas seriously, and a critical sub-filter is where you're willing to take ideas seriously even though the people around you don't.

Going to a group where cryonics was normal was a shift of perspective even for me, and here I thought I had conformity beat. It was what caused me to realize - no, parents who don't sign their kids up for cryonics really are doing something inexcusable; the mistake is not inevitable, it's just them.