I think the title of the essay actually begs the question a bit. The Galileo quote ("Eppur si muove") refers to an incident where the objective facts were on th

I think the title of the essay actually begs the question a bit. The Galileo quote ("Eppur si muove") refers to an incident where the objective facts were on the side of the persecuted speaker. Here the author discusses a clash of opinion: depending on the criteria used to assess its outcomes, or how the technology is developed or implemented, radical life extension work could indeed turn out to be unethical - we don't have access to the relevant priors of the discussants. It's possible that utterances like this give people an impression of unexamined or unearned certainty to which they react negatively.