Not sure what you are replying to. What information cascade? What theory? What tragedy? I'm lost.
(For reference, I upvoted you because it was an interesting insight and I was just trying to draw out more content. But since you offered three question marks to my single question mark it looks like maybe I should spell out what I meant explicitly...)
An information cascade occurs when evidence is counted twice. One person sees something and tells two other people. A fourth person hears the story from each without realizing it was the same story told second hand and counts it as having happened twice. A fifth person hears the second and fourth without ...
When I've brought up cryonics on LessWrong [1][2], most commenters have said I'm being too pessimistic. When I brought it up yesterday at the Cambridge MA meetup, most people thought I was too optimistic. (I think it could work, but there are enough things that could go wrong that it's ~1000:1 against.) What makes the groups so different on this?
[1] Brain Preservation
[2] How Likely is Cryonics to Work